{"id":"CVE-2026-20218","revision":"1f8dae7a768541b4baa491b06bc781d0","records":[{"revision":"1f8dae7a768541b4baa491b06bc781d0","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-20218","aliases":[],"title":"Cisco Secure Firewall Threat Defense Snort 3 Visual Basic for Applications Buffer Overflow Denial of Service Vulnerability","description":"A vulnerability in the Snort 3 Visual Basic for Applications (VBA) Decompression Engine of multiple Cisco products could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart unexpectedly, resulting in a denial of service (DoS) condition.  \r\n\r\nThis vulnerability is due to improper range checking when Snort 3 decompresses VBA data, which is user controlled. An attacker could exploit this vulnerability by sending crafted VBA data to the Snort 3 Detection Engine of a targeted device. A successful exploit could allow the attacker to cause an overflow of stack data, which could result in a DoS condition.","state":0,"publishedAt":"2026-10-21T16:12:38.494+00:00","modifiedAt":"2026-10-22T19:11:10.095+00:00","affected":[{"ecosystem":"Vendor product","name":"Cisco Open Source Snort3","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Cisco\",\n                    \"product\": \"Cisco Open Source Snort3\",\n                    \"versions\": [\n                        {\n                            \"version\": \"3.12.2.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.2.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.3.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.4.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.5.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.6.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.7.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.8.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.9.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.10.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.12.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.13.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.14.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.15.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.16.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.17.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.18.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.19.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.20.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.21.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.22.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.23.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.24.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.25.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.27.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.28.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.29.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.30.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.31.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.32.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.36.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.38.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.39.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.40.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.41.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.42.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.43.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.45.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.47.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.48.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.50.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.51.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.52.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.53.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.55.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.56.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.57.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.58.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.59.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.60.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.61.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.62.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.63.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.64.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.65.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.66.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.67.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.69.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.70.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.71.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.72.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.73.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.74.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.75.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.76.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.77.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.78.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.81.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.82.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.83.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.1.84.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.2.1.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.2.2.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.3.0.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.3.1.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.3.2.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.3.3.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.3.4.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.3.5.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.3.7.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.5.0.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.5.1.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.8.1.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.6.0.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.6.2.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.9.3.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.7.2.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.7.0.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.9.6.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.10.0.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.10.2.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.7.4.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.9.0.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.5.2.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.12.1.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.6.1.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.9.2.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.6.3.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.9.5.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.7.1.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.9.7.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.7.3.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.10.1.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.9.1.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"3.11.1.0\",\n                            \"status\": \"affected\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unknown\"\n                }"},{"ecosystem":"Vendor product","name":"Cisco Secure Firewall Threat Defense (FTD) Software","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Cisco\",\n                    \"product\": \"Cisco Secure Firewall Threat Defense (FTD) Software\",\n                    \"versions\": [\n                        {\n                            \"version\": \"7.2.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.2.0.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.2.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.3.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.2.2\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.2.3\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.3.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.2.5\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.2.4.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": 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                  },\n                        {\n                            \"version\": \"7.4.2.4\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.2.10.2\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.4.3\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.6.4\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"10.0.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.4.4\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.2.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"7.4.7\",\n                            \"status\": \"affected\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unknown\"\n                }"},{"ecosystem":"Vendor product","name":"Cisco UTD SNORT IPS Engine Software","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Cisco\",\n                    \"product\": \"Cisco UTD SNORT IPS Engine Software\",\n                    \"versions\": [\n                        {\n                            \"version\": \"17.12.1a\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"17.12.2\",\n                            \"status\": 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\"affected\"\n                        },\n                        {\n                            \"version\": \"17.15.4\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"17.18.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"17.18.1a\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"17.12.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"17.15.4c\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"17.12.5d\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"17.18.2\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"26.1.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"17.15.5\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"17.15.5a\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"17.12.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"17.12.7a\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"17.12.7b\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"17.18.3a\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"17.12.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"17.15.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"17.18.4\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"26.1.2\",\n                            \"status\": \"affected\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unknown\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","score":5.8,"severity":"MEDIUM"}],"references":["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-vba-bufdos-jAuFdvn9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-20218","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-20218","identifiers":["CVE-2026-20218"]},"retained":false,"historicalAffected":[]}],"coverage":[]}