cisco-sa-fmc-rce-NKhnULJhCriticalCVSS 10.0

Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability

Published
March 4, 2026
Last Modified
March 25, 2026

🔗 CVE IDs covered (1)

CVE-2026-20131 →

📋 Description

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.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is part of the March 2026 release of the Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: March 2026 Semiannual Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75736"].

CVE-2026-20131 — Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability (CVSS 3.1 10.0, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)

🎯 Affected products73

  • Cisco Secure Firewall Management Center (FMC)
  • Cisco Secure Firewall Management Center (FMC) Appliances
  • Cisco Secure Firewall Management Center (FMC) 10.0.0
  • Cisco Secure Firewall Management Center (FMC) 6.4.0.13
  • Cisco Secure Firewall Management Center (FMC) 6.4.0.14
  • Cisco Secure Firewall Management Center (FMC) 6.4.0.15
  • Cisco Secure Firewall Management Center (FMC) 6.4.0.16
  • Cisco Secure Firewall Management Center (FMC) 6.4.0.17
  • Cisco Secure Firewall Management Center (FMC) 6.4.0.18
  • Cisco Secure Firewall Management Center (FMC) 7.0.0
  • Cisco Secure Firewall Management Center (FMC) 7.0.0.1
  • Cisco Secure Firewall Management Center (FMC) 7.0.1
  • Cisco Secure Firewall Management Center (FMC) 7.0.1.1
  • Cisco Secure Firewall Management Center (FMC) 7.0.2
  • Cisco Secure Firewall Management Center (FMC) 7.0.2.1
  • Cisco Secure Firewall Management Center (FMC) 7.0.3
  • Cisco Secure Firewall Management Center (FMC) 7.0.4
  • Cisco Secure Firewall Management Center (FMC) 7.0.5
  • Cisco Secure Firewall Management Center (FMC) 7.0.6
  • Cisco Secure Firewall Management Center (FMC) 7.0.6.1
  • Cisco Secure Firewall Management Center (FMC) 7.0.6.2
  • Cisco Secure Firewall Management Center (FMC) 7.0.6.3
  • Cisco Secure Firewall Management Center (FMC) 7.0.7
  • Cisco Secure Firewall Management Center (FMC) 7.0.8
  • Cisco Secure Firewall Management Center (FMC) 7.0.8.1
  • Cisco Secure Firewall Management Center (FMC) 7.1.0
  • Cisco Secure Firewall Management Center (FMC) 7.1.0.1
  • Cisco Secure Firewall Management Center (FMC) 7.1.0.2
  • Cisco Secure Firewall Management Center (FMC) 7.1.0.3
  • Cisco Secure Firewall Management Center (FMC) 7.2.0
  • +43 more not shown

✅ Remediation

Cisco has released software updates that address this vulnerability. https://software.cisco.com Workarounds: There are no workarounds that address this vulnerability.

🔗 References (6)