{"id":"CVE-2026-102077","revision":null,"records":[{"revision":"e14af93b48594195b3c9c076784d6372","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-102077","aliases":[],"title":"Junos OS: MX Series with SPC3: In a source NAT scenario malformed packets will lead to resource leaks and eventually traffic stops","description":"An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on MX Series with SPC3 allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).\n\n\n\nOn MX Series with SPC3 line-card and source NAT configuration, when a specific malformed IPv6 packet is received, it is not dropped but instead a session is created and NAT resources are allocated.\u00A0Continued receipt of such packets will eventually lead to session or resource exhaustion, which will impact all traffic through the device. To recover the device needs to be rebooted.\nTo monitor session usage, use the following:\n\nshow services sessions summary\n\nTo monitor source NAT resource usage, use the following:\u00A0\n\nshow services nat pool\n\nThis issue affects\u00A0Junos OS on MX Series with SPC3:\n\n  *  All versions before 23.2R2-S4;\n  *  23.4 versions before 23.4R2-S5;\n  *  24.2 versions before 24.2R2.","state":0,"publishedAt":"2026-10-14T17:14:01.511+00:00","modifiedAt":"2026-10-14T20:26:08.665+00:00","affected":[{"ecosystem":"Vendor product","name":"Junos OS","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"platforms\": [\n                        \"MX Series with SPC3\"\n                    ],\n                    \"product\": \"Junos OS\",\n                    \"vendor\": \"Juniper Networks\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"23.2R2-S4\",\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"versionType\": \"custom\"\n                        },\n                        {\n                            \"lessThan\": \"23.4R2-S5\",\n                            \"status\": \"affected\",\n                            \"version\": \"23.4\",\n                            \"versionType\": \"custom\"\n                        },\n                        {\n                            \"lessThan\": \"24.2R2\",\n                            \"status\": \"affected\",\n                            \"version\": \"24.2\",\n                            \"versionType\": \"custom\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"},{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:U/RE:M","score":8.7,"severity":"HIGH"}],"references":["https://supportportal.juniper.net/JSA112182"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-102077","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-102077","identifiers":["CVE-2026-102077"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-47ea30d05491460caa5ce44b8cba58f9","complete":false,"records":13686,"lastAttemptAt":"2026-11-09T23:17:21.9523007+00:00","lastSuccessAt":"2026-11-09T23:17:21.948+00:00","error":"35 identifier lookups failed; latest failures include HTTP 403. Other identifiers were checked independently.","lastVerifiedAt":"2026-11-09T23:17:21.948+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13669,"expectedIdentifiers":13739,"failedIdentifiers":35},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-09T23:04:35.5115198+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T23:04:35.5115198+00:00","lastSuccessAt":"2026-11-09T23:04:35.7206951+00:00","error":null,"lastVerifiedAt":"2026-11-09T23:04:35.7206952+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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