[KEV] CVE-2026-20316 -- CVSS 0.0 Vulnerability Briefing

[KEV] CVE-2026-20316 | CVSS 0.0 (Low) | Exploit: Operational

What Is It

CVE-2026-20316 is a hard-coded password vulnerability in Cisco Secure Firewall Management Center (FMC) that permits remote access to the FMC management interface through a low-privileged account.

Technical Detail

The vulnerability results from the presence of hard-coded credentials in affected Cisco Secure Firewall Management Center systems. An unauthenticated remote attacker can use these credentials to authenticate to an affected device as a low-privileged user, constituting an authentication bypass. Successful exploitation allows access to sensitive data available to that account, but the available information does not confirm remote code execution or administrative privilege escalation.

Exploitation Status

Exploit maturity is assessed as Operational, meaning exploitation methods are sufficiently developed for use in real-world attacks. CISA has confirmed active exploitation in the wild, and the vulnerability was added to the Known Exploited Vulnerabilities Catalog on July 29, 2026.

Who Is Targeting This

No specific threat actor attribution at this time.

What To Do

Apply Cisco security updates for affected Secure Firewall Management Center deployments as a priority. CISA binding directive requirements apply: patch by August 19, 2026, or apply mitigations. Restrict FMC management-interface access to authorized administrative networks, avoid exposing management services directly to the internet, and review authentication and access logs for unexpected use of low-privileged accounts or connections from unfamiliar source addresses. Follow Cisco guidance for any available credential, account, or configuration remediation steps, and investigate potentially exposed sensitive data where unauthorized access is identified.