CISCO Security Advisory
Published Date: Not specified
CVE: CVE-2026-20316
Advisory Summary
🔷 🚨 Cisco Secure Firewall FMC Static Credential Vulnerability (CVE-2026-20316)
- A vulnerability exists in the web interface of Cisco Secure Firewall Management Center (FMC) Software.
- An unauthenticated remote attacker may be able to log in using a static, low-privileged account, then access sensitive data.
- Cisco assigned SIR: High because the flaw can be combined with other FMC vulnerabilities to elevate privileges—turning a limited access path into a broader compromise risk.
- If the FMC management interface is not exposed to the public internet, the exposure (and practical likelihood) is reduced.
- However, networks with direct/indirect reachability (misconfigured firewall rules, VPN bypass paths, exposed reverse proxies) remain at risk.
- Cisco released software updates to remediate the issue.
- No workarounds are provided for this vulnerability—so patching is the primary mitigation.
- Restrict FMC management to trusted IPs/VPN/jump hosts only.
- Eliminate public exposure; remove any unnecessary NAT/port-forwarding.
- Unexpected sessions originating from untrusted networks
- Unusual access to sensitive configuration/data endpoints shortly after connection
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-2026-20316 #
Reference: Vendor Advisory