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CVE-2026-20131

Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability

  • Critical 10.0
  • Exploited: added to CISA KEV 19 Mar 2026
  • Used in ransomware campaigns

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.

Key facts

Published
4 Mar 2026
Last changed
14 Aug 2026
Assigned by
cisco
KEV added
19 Mar 2026
KEV fix due
22 Mar 2026
Used in ransomware
Yes, according to CISA
EPSS
44.431% likely to be exploited in the next 30 days, higher than 98.785% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 10.0CVSS 3.1, Criticalfrom the CNA (cisco)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

What to do

  • Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
CiscoCisco Secure Firewall Management Center (FMC)
  • Default status: unknown
  • 7.0.0 (affected)
  • 7.0.0.1 (affected)
  • 7.0.1 (affected)
  • 7.1.0 (affected)
  • 6.4.0.13 (affected)
  • 7.0.1.1 (affected)
  • 6.4.0.14 (affected)
  • 7.1.0.1 (affected)
  • 7.0.2 (affected)
  • 6.4.0.15 (affected)
  • 7.2.0 (affected)
  • 7.0.2.1 (affected)
  • 7.0.3 (affected)
  • 7.1.0.2 (affected)
  • 7.2.0.1 (affected)
  • 7.0.4 (affected)
  • 7.2.1 (affected)
  • 7.0.5 (affected)
  • 6.4.0.16 (affected)
  • 7.3.0 (affected)
  • 7.2.2 (affected)
  • 7.3.1 (affected)
  • 7.2.3 (affected)
  • 7.1.0.3 (affected)
  • 7.2.3.1 (affected)
  • 7.2.4 (affected)
  • 7.0.6 (affected)
  • 7.2.4.1 (affected)
  • 7.2.5 (affected)
  • 7.3.1.1 (affected)
  • 7.4.0 (affected)
  • 6.4.0.17 (affected)
  • 7.0.6.1 (affected)
  • 7.2.5.1 (affected)
  • 7.4.1 (affected)
  • 7.2.6 (affected)
  • 7.4.1.1 (affected)
  • 7.0.6.2 (affected)
  • 6.4.0.18 (affected)
  • 7.2.7 (affected)
  • 7.2.5.2 (affected)
  • 7.3.1.2 (affected)
  • 7.2.8 (affected)
  • 7.6.0 (affected)
  • 7.4.2 (affected)
  • 7.2.8.1 (affected)
  • 7.0.6.3 (affected)
  • 7.4.2.1 (affected)
  • 7.2.9 (affected)
  • 7.0.7 (affected)
  • 7.7.0 (affected)
  • 7.4.2.2 (affected)
  • 7.2.10 (affected)
  • 7.6.1 (affected)
  • 7.4.2.3 (affected)
  • 7.0.8 (affected)
  • 7.6.2 (affected)
  • 7.7.10 (affected)
  • 7.2.10.1 (affected)
  • 7.0.8.1 (affected)
  • 7.6.2.1 (affected)
  • 7.2.10.2 (affected)
  • 7.7.10.1 (affected)
  • 7.4.2.4 (affected)
  • 7.4.3 (affected)
  • 7.7.11 (affected)
  • 7.6.4 (affected)
  • 10.0.0 (affected)
  • 7.4.4 (affected)
  • 7.4.5 (affected)

Timeline

  1. 4 Mar 2026 Published
  2. 19 Mar 2026 CVE-2026-20131 added to CISA KEV
  3. 19 Mar 2026 Added to the CISA KEV catalogue

Weakness

References