CVE-2026-20242

CVE CVE-2026-20242EUVD EUVD-2026-81109Published 2026-09-16T20:08:27.000ZLast changed 2026-09-18T03:55:57.000ZCVSS 9.8

What the advisory describes

A vulnerability in the External Database Access feature of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to execute arbitrary commands as root on an affected device. This vulnerability is due to insecure deserialization of a user-supplied Java byte stream from a host that is configured in the external database access list. An attacker could exploit this vulnerability by sending a crafted, serialized Java byte stream to a specific TCP port of an affected device. A successful exploit could allow the attacker to execute arbitrary commands on the device and elevate privileges to root. Notes: This vulnerability can be exploited only by an attacker who has control of a host in the external database access list. If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced.

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

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.