CVE-2026-20341

CVE CVE-2026-20341EUVD EUVD-2026-81110Published 2026-09-16T20:08:28.000ZLast changed 2026-09-18T03:55:58.000ZCVSS 9.1

What the advisory describes

A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure FMC Software could allow an authenticated, remote attacker to obtain root privileges. This vulnerability is due to unsecured deserialization of untrusted data over the sftunnel management connection. An attacker could exploit this vulnerability by sending crafted sftunnel remote procedure calls (RPCs). A successful exploit could allow the attacker to gain root privileges on a device that is running Cisco Secure FMC Software and its high-availability peer. To exploit this vulnerability, the attacker must have valid administrative credentials on a managed Cisco FTD device.

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

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.