CVE-2026-20340

CVE CVE-2026-20340EUVD EUVD-2026-81116Published 2026-09-16T20:10:07.000ZLast changed 2026-09-18T03:56:07.000ZCVSS 8.8

What the advisory describes

A vulnerability in Cisco Secure FMC Software could allow an authenticated, remote attacker to execute arbitrary commands at the root privilege level. This vulnerability is due to unsecured deserialization of web-management user-controlled data. An attacker could exploit this vulnerability by authenticating to the device and sending a crafted HTTP payload. A successful exploit could allow the attacker to save the crafted payload and then execute it on the underlying operating system as root. To exploit this vulnerability, the attacker must have valid credentials for a user account with at least the role of Security Analyst (read-only).

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 Management Center (FMC) 7.6.2; 7.3.1; 7.0.6; 7.4.4; 7.4.7; 7.2.5; 10.0.0; 7.6.1; 7.4.5; 7.6.3; 7.2.10.2; 7.0.4; 7.0.5; 7.2.8.1; 7.4.1; 7.2.1; 10.0.1; 7.7.10; 7.0.6.2; 7.2.0; 7.2.4.1; 7.0.0.1; 7.7.10.1; 7.2.7; 7.4.2.1; 7.0.6.3; 7.6.0; 7.2.6; 7.4.6; 7.2.5.1; 7.0.1; 7.7.0; 7.2.10; 7.4.3; 7.3.0; 7.7.12; 7.2.2; 7.3.1.2; 7.4.2; 7.2.8; 7.4.0; 7.0.2; 7.4.2.4; 7.6.2.1; 7.2.5.2; 7.7.11; 7.2.9; 7.2.10.1; 7.2.4; 7.0.1.1; 7.0.7; 7.2.0.1; 7.0.3; 7.4.1.1; 7.2.3.1; 7.0.6.1; 7.3.1.1; 7.0.8.1; 7.2.3; 7.0.2.1; 7.4.2.2; 7.6.5; 7.0.9; 7.4.2.3; 7.6.4; 7.0.0; 7.0.8; 7.2.11

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 Management Center (FMC)

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.