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CVE-2026-20131 — Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability

CVE-2026-20131 · Secure Firewall Management Center (FMC) · CVSS 10 ·…

In brief

Severity · CVSS
Critical10CVSS 3.1, Critical
EPSS
43%
CISA KEV
Known exploited, listed since 19 Mar 2026
Vendor
Cisco
Published · Modified
·
Last verified

Summary

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.

Weakness: CWE-502

Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.

Affected and fixed versions

Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.

9 branches without a precise fixed release

Cisco Secure Firewall Management Center (FMC)

Source: CVE-2026-20131cisco-sa-fmc-rce-NKhnULJh

  1. 10.0
    Affected versions10.0
    First fixed releaseNot published in the sources followed
  2. 7.7
    Affected versions7.7, 7.7.10, 7.7.10.1, 7.7.11
    First fixed releaseNot published in the sources followed
  3. 7.6
    Affected versions7.6, 7.6.1, 7.6.2, 7.6.2.1
    5 releases listed7.6, 7.6.1, 7.6.2, 7.6.2.1, 7.6.4
    First fixed releaseNot published in the sources followed
  4. 7.4
    Affected versions7.4, 7.4.1, 7.4.1.1, 7.4.2
    11 releases listed7.4, 7.4.1, 7.4.1.1, 7.4.2, 7.4.2.1, 7.4.2.2, 7.4.2.3, 7.4.2.4, 7.4.3, 7.4.4, 7.4.5
    First fixed releaseNot published in the sources followed
  5. 7.3
    Affected versions7.3, 7.3.1, 7.3.1.1, 7.3.1.2
    First fixed releaseNot published in the sources followed
  6. 7.2
    Affected versions7.2, 7.2.0.1, 7.2.1, 7.2.2
    19 releases listed7.2, 7.2.0.1, 7.2.1, 7.2.2, 7.2.3, 7.2.3.1, 7.2.4, 7.2.4.1, 7.2.5, 7.2.5.1, 7.2.5.2, 7.2.6, 7.2.7, 7.2.8, 7.2.8.1, 7.2.9, 7.2.10, 7.2.10.1, 7.2.10.2
    First fixed releaseNot published in the sources followed
  7. 7.1End of life
    Affected versions7.1, 7.1.0.1, 7.1.0.2, 7.1.0.3
    First fixed releaseNot published in the sources followed
  8. 7.0
    Affected versions7.0, 7.0.0.1, 7.0.1, 7.0.1.1
    16 releases listed7.0, 7.0.0.1, 7.0.1, 7.0.1.1, 7.0.2, 7.0.2.1, 7.0.3, 7.0.4, 7.0.5, 7.0.6, 7.0.6.1, 7.0.6.2, 7.0.6.3, 7.0.7, 7.0.8, 7.0.8.1
    First fixed releaseNot published in the sources followed
  9. 6.4End of life
    Affected versions6.4.0.13, 6.4.0.14, 6.4.0.15, 6.4.0.16
    6 releases listed6.4.0.13, 6.4.0.14, 6.4.0.15, 6.4.0.16, 6.4.0.17, 6.4.0.18
    First fixed releaseNot published in the sources followed

The vendor states fixes are available; the releases per branch are in its advisory.

Remediation

Fix available

Vendor fix

Cisco has released updates that fix this vulnerability; its advisory lists them.

SourceCisco Security Advisory cisco-sa-fmc-rce-NKhnULJh· revised 25 Mar 2026

Workarounds (vendor)

Cisco states in its advisory that no workaround is available.

SourceCisco Security Advisory cisco-sa-fmc-rce-NKhnULJh

CISA KEV required action

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 due date:

SourceCISA KEV

CERT-FR recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

SourceCERTFR-2026-AVI-0242

Last verified 1 Oct 2026 at 09:32 UTC

Known exploitation

Added to CISA KEV on 19 Mar 2026

Federal remediation due date: 22 Mar 2026

Known use in ransomware campaigns

The CISA required action is shown under Remediation.

43% probability of exploitation in the next 30 days (percentile 99%).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CERT-FR

1 document of the French national CERT (ANSSI) references this CVE.

Advisory (AVI)CERTFR-2026-AVI-0242Published 5 Mar 2026

Multiple vulnerabilities in Cisco products

Remote denial of serviceRemote arbitrary code executionData integrity breachSQL injection (SQLi)Not specified by the vendorSecurity policy bypassData confidentiality breach

Summary

Multiple vulnerabilities have been discovered in Cisco products. Some of them allow an attacker to cause remote arbitrary code execution, remote denial of service, and a data confidentiality breach.

Recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

Official document on cert.ssi.gouv.frread by Patcharo 28 Sept 2026 at 20:03 UTCMachine translation of the French text published by CERT-FR; a text whose translation did not pass Patcharo's checks stays in French. Identifiers, versions and links are copied unchanged.

Timeline

  1. Published by the source
  2. Added to CISA KEV
  3. CISA remediation due date
  4. Source record last modified
  5. EPSS score computed
  6. Last verified by Patcharo

Official sources

References

Cisco · CISA Known Exploited Vulnerabilities · NVD · FIRST EPSS · Cisco Security Advisory cisco-sa-fmc-rce-NKhnULJh

How Patcharo reads this

Affected and fixed releases come from the vendor's structured statements and are matched against exact versions; CVSS from NVD, exploitation from CISA KEV and the vendor's own advisory, probability from FIRST EPSS. Missing data stays Unknown and never becomes Not affected.

Read the methodologyRead the guide: Cisco Secure Firewall release trains: Threat Defense, Management Center and ASA versions explained

Related vulnerabilities

Other records affecting the same products, newest first.

  • CVE-2026-20316Cisco Secure Firewall Management Center Software Static Credential VulnerabilityMediumKEVRansomware
  • CVE-2026-20079Cisco Secure Firewall Management Center Authentication Bypass Remote Code Execution VulnerabilityCriticalKEV

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