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

> CVE-2026-20079: Cisco Secure Firewall Management Center Authentication Bypass Remote Code Execution Vulnerability. CVSS 10.0 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2026-20079
Last updated: 2026-09-16T20:08:37Z

- Published: 2026-03-04 17:17 UTC · Updated: 2026-09-16 20:08 UTC · Assigner: cisco
- CVSS: 10.0 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- EPSS: 88.5%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-09-09, federal due date 2026-09-12, ransomware use: Unknown
- CWE: CWE-288

## Description

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. 

## CISA 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). 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.

## Affected vendors and products

- Cisco: Cisco Secure Firewall Management Center (FMC)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-20079)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-20079)
- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-onprem-fmc-authbypass-5JPp45V2](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-onprem-fmc-authbypass-5JPp45V2)

---

_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-20079 · Markdown: https://rewindex.com/cve/CVE-2026-20079.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-20079 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:15.090Z