CVE-2026-20079 - Vulnerability Analysis

Overview

Cisco Secure Firewall Management Center Software contains an authentication bypass caused by improper system process creation at boot, letting unauthenticated remote attackers execute scripts and gain root access, exploit requires crafted HTTP requests.

Severity & Score

Impact

Unauthenticated remote attackers can gain root access by executing scripts, leading to full system compromise.

Mitigation

Update to the latest available version.

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-onprem-fmc-authbypass-5JPp45V2

Social Media Activity(1 post)

Caitlin Condon

@catc0n

Mar 26, 2026

After 2+ weeks of semi-painful exploit development, @yeslikethefood and team have a full RCA out for Cisco Secure Firewall Management Center (FMC) CVE-2026-20079. The bug is a CVSS 10, but there are significant prerequisites that may limit exploitability in real-world scenarios. There are between 300 and 700 FMC systems on the public internet as of today. https://www.vulncheck.com/blog/cisco-fmc-auth-bypass-cve-2026-20079

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GitHub Repositories(2 repos)

• https://github.com/0xBlackash/CVE-2026-20079
• https://github.com/Sushilsin/CVE-2026-20079

Related Resources

• Vulnerability Intelligence Dashboard
• Credential Scanner