CVE-2026-20290

CVE CVE-2026-20290EUVD EUVD-2026-81150Published 2026-09-16T20:19:02.000ZLast changed 2026-09-17T17:29:41.000ZCVSS 5.8

What the advisory describes

A vulnerability in SSL/TLS certificate parsing in the Snort 2 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 2 Detection Engine to restart. This vulnerability is due to incomplete validation of the SSL certificate. An attacker could exploit this vulnerability by sending a crafted SSL connection setup request to be parsed by Snort 2. A successful exploit could allow the attacker to cause the Snort 2 Detection Engine to restart unexpectedly, resulting in a denial of service (DoS) condition.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Cisco — Cisco Secure Firewall Threat Defense (FTD) Software 7.2.2; 7.4.2.2; 7.0.6.1; 7.0.9; 7.0.4; 7.0.5; 7.6.2.1; 7.0.6.2; 7.6.2; 7.0.0.1; 7.0.0; 7.4.3; 7.3.1; 7.6.1; 7.2.4; 7.4.2; 7.2.5.2; 7.2.5.1; 7.0.8; 7.2.0.1; 7.4.2.3; 7.3.0; 7.0.3; 7.3.1.2; 7.2.9; 7.4.0; 7.2.4.1; 7.2.1; 7.2.6; 7.2.3; 7.4.1; 7.2.8.1; 7.0.2.1; 7.3.1.1; 7.0.6; 7.4.4; 7.4.2.4; 7.6.4; 7.4.2.1; 7.4.1.1; 7.2.11; 7.0.2; 7.2.10; 7.0.1; 7.2.0; 7.0.8.1; 7.2.10.2; 7.6.0; 7.4.7; 7.0.1.1; 7.0.7; 7.0.6.3; 7.2.8; 7.2.5; 7.2.7

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Cisco — Secure Firewall Threat Defense (FTD) Software

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.