Detections
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Cisco Secure Firewall Management Center Software RCE (cisco-sa-fmc-rce-NKhnULJh)

critical Nessus Plugin ID 302914

Synopsis

The remote device is missing a vendor-supplied security patch.

Description

According to its self-reported version, Cisco Secure Firewall Management Center (FMC) is affected by a vulnerability.

 - A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to execute arbitrary Java code as root on an affected device. This vulnerability is due to insecure deserialization of a user-supplied Java byte stream. An attacker could exploit this vulnerability by sending a crafted serialized Java object to the web-based management interface of an affected device. A successful exploit could allow the attacker to execute arbitrary code on the device and elevate privileges to root. Note: If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced. (CVE-2026-20131)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCwt14636

See Also

http://www.nessus.org/u?132973e8

http://www.nessus.org/u?73afe95c

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwt14636

Plugin Details

Severity: Critical

ID: 302914

File Name: cisco-sa-fmc-rce-NKhnULJh.nasl

Version: 1.2

Type: local

Family: CISCO

Published: 3/18/2026

Updated: 3/19/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.2

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-20131

CVSS v3

Risk Factor: Critical

Base Score: 10

Temporal Score: 9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:cisco:firepower_management_center

Required KB Items: Host/Cisco/firepower_mc/version

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/4/2026

Vulnerability Publication Date: 3/4/2026

Reference Information

CVE: CVE-2026-20131

CWE: 502

CISCO-SA: cisco-sa-fmc-rce-NKhnULJh

IAVA: 2026-A-0201

CISCO-BUG-ID: CSCwt14636