Static Credential Flaw (CVE‑2026‑20316) in Cisco Secure Firewall Management Center Enables Unauthenticated Access
What It Is — Cisco Secure Firewall Management Center (FMC) contains a hard‑coded low‑privileged account that can be used without authentication to log in to the web interface.
Exploitability — Active exploitation confirmed by Cisco PSIRT (July 2026). CVSS 5.3 (moderate). No public PoC required; the credential is built‑in.
Affected Products — Cisco Secure Firewall Management Center (FMC) software versions 7.0, 7.2, 7.4, 7.6, 7.7, 10.0 (see hot‑fix list).
Why It Matters for Compliance & Audit Readiness
- SOC 2 Access Control criteria (CC6.1, CC6.2) require that privileged and low‑privileged accounts be uniquely provisioned and that hard‑coded credentials be eliminated.
- Continuous monitoring of authentication logs is essential evidence that your environment is free of undocumented accounts.
- Enterprise buyers increasingly demand proof that firewalls are managed under a documented, auditable access‑control program; a known‑exploited flaw can invalidate that trust.
Recommended Actions
- Apply the Cisco‑provided hot‑fix for your FMC version immediately.
- Verify removal of the hard‑coded account by scanning
/var/log/messagesforlicense.tmpreferences. - Update your SOC 2 access‑control policy to require periodic review of vendor‑supplied default credentials and log‑based evidence collection.
- Incorporate the FMC authentication log check into your continuous compliance monitoring platform.
Source: Security Affairs – CISA adds Cisco FMC flaw to KEV catalog