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CVE-2026-20079 — Cisco Secure Firewall Management Center Authentication Bypass Remote Code Execution Vulnerability

CVE-2026-20079 · Secure Firewall Management Center (FMC) · CVSS 10 ·…

In brief

Severity · CVSS
Critical10CVSS 3.1, Critical
EPSS
88%
CISA KEV
Known exploited, listed since 9 Sept 2026
Vendor
Cisco
Published · Modified
·
Last verified

Summary

A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system.  This vulnerability is due to an improper system process that is created at boot time. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute a variety of scripts and commands that allow root access to the device. 

Weakness: CWE-288

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.

7 branches with a published fixed release · 2 branches without a precise fixed release

Cisco Secure Firewall Management Center (FMC)

Source: cisco-sa-onprem-fmc-authbypass-5JPp45V2CVE-2026-20079

  1. 10.1
    Affected versions< 10.1.0
    First fixed release10.1
  2. 10.0
    Affected versions10.0, 10.0.1
    First fixed release10.0.2
  3. 7.7
    Affected versions7.7, 7.7.10, 7.7.10.1, 7.7.11
    5 releases listed7.7, 7.7.10, 7.7.10.1, 7.7.11, 7.7.12
    First fixed release7.7.13
  4. 7.6
    Affected versions7.6, 7.6.1, 7.6.2, 7.6.2.1
    7 releases listed7.6, 7.6.1, 7.6.2, 7.6.2.1, 7.6.3, 7.6.4, 7.6.5
    First fixed release7.6.6
  5. 7.4
    Affected versions7.4, 7.4.1, 7.4.1.1, 7.4.2
    13 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, 7.4.6, 7.4.7
    First fixed release7.4.8
  6. 7.3
    Affected versions7.3, 7.3.1, 7.3.1.1, 7.3.1.2
    First fixed releaseNot published in the sources followed
  7. 7.2
    Affected versions7.2, 7.2.0.1, 7.2.1, 7.2.2
    20 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, 7.2.11
    First fixed release7.2.12
  8. 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
  9. 7.0
    Affected versions7.0, 7.0.0.1, 7.0.1, 7.0.1.1
    17 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, 7.0.9
    First fixed release7.0.10

Remediation

Fix available

Vendor fix

  • Secure Firewall Management Center (FMC) 10.110.1
  • Secure Firewall Management Center (FMC) 10.010.0.2
  • Secure Firewall Management Center (FMC) 7.77.7.13
  • Secure Firewall Management Center (FMC) 7.67.6.6
  • Secure Firewall Management Center (FMC) 7.47.4.8
  • Secure Firewall Management Center (FMC) 7.27.2.12
  • Secure Firewall Management Center (FMC) 7.07.0.10

Upgrade to a fixed release listed above for your branch, or to a later fixed release the vendor explicitly supports.

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

SourceCisco Security Advisory cisco-sa-onprem-fmc-authbypass-5JPp45V2

Workarounds (vendor)

Cisco states in its advisory that no workaround is available.

SourceCisco Security Advisory cisco-sa-onprem-fmc-authbypass-5JPp45V2

CISA KEV required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes).

Full CISA action

Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

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 9 Sept 2026

Federal remediation due date: 12 Sept 2026

The CISA required action is shown under Remediation.

88% probability of exploitation in the next 30 days (percentile 100%).

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

Known exploited

Cisco · CISA Known Exploited Vulnerabilities · NVD · FIRST EPSS · Cisco Security Advisory cisco-sa-onprem-fmc-authbypass-5JPp45V2

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-2026-20131Cisco Secure Firewall Management Center Software Remote Code Execution VulnerabilityCriticalKEVRansomware

All Secure Firewall Management Center (FMC) vulnerabilitiesAll Cisco vulnerabilities