CVE-2026-20250

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software · denial of service

CVSS 3.1 8.6 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-20250

Published

A vulnerability in Datagram TLS (DTLS) message handling of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software for Cisco Secure Firewall 3100 Series and 4200 Series devices could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper resource management when processing certain DTLS messages. An attacker could exploit this vulnerability by sending a crafted stream of DTLS traffic to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-20250

Published

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Cisco",
                    "product": "Cisco Secure Firewall Adaptive Security Appliance (ASA) Software",
                    "versions": [
                        {
                            "version": "9.23.1",
                            "status": "affected"
                        },
                        {
                            "version": "9.22.1.1",
                            "status": "affected"
                        },
                        {
                            "version": "9.22.1.3",
                            "status": "affected"
                        },
                        {
                            "version": "9.22.1.6",
                            "status": "affected"
                        },
                        {
                            "version": "9.22.2",
                            "status": "affected"
                        },
                        {
                            "version": "9.23.1.3",
                            "status": "affected"
                        },
                        {
                            "version": "9.22.2.4",
                            "status": "affected"
                        },
                        {
                            "version": "9.23.1.7",
                            "status": "affected"
                        },
                        {
                            "version": "9.22.2.9",
                            "status": "affected"
                        },
                        {
                            "version": "9.23.1.13",
                            "status": "affected"
                        },
                        {
                            "version": "9.22.2.13",
                            "status": "affected"
                        },
                        {
                            "version": "9.23.1.19",
                            "status": "affected"
                        },
                        {
                            "version": "9.22.2.14",
                            "status": "affected"
                        },
                        {
                            "version": "9.24.1",
                            "status": "affected"
                        },
                        {
                            "version": "9.23.1.22",
                            "status": "affected"
                        },
                        {
                            "version": "9.22.2.20",
                            "status": "affected"
                        },
                        {
                            "version": "9.23.1.26",
                            "status": "affected"
                        }
                    ],
                    "defaultStatus": "unknown"
                }

Cisco Secure Firewall Threat Defense (FTD) Software

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Cisco",
                    "product": "Cisco Secure Firewall Threat Defense (FTD) Software",
                    "versions": [
                        {
                            "version": "7.6.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.7.0",
                            "status": "affected"
                        },
                        {
                            "version": "7.6.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.6.2",
                            "status": "affected"
                        },
                        {
                            "version": "7.7.10",
                            "status": "affected"
                        },
                        {
                            "version": "7.7.11",
                            "status": "affected"
                        },
                        {
                            "version": "7.6.2.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.7.10.1",
                            "status": "affected"
                        },
                        {
                            "version": "7.6.4",
                            "status": "affected"
                        },
                        {
                            "version": "10.0.0",
                            "status": "affected"
                        }
                    ],
                    "defaultStatus": "unknown"
                }

Original source record · Cite this exact observation · Complete original publisher JSON