CISA Warns of Actively Exploited Zero-Day in Cisco Firewall Management Center

CISA alerts on a zero-day flaw in Cisco's Secure Firewall Management Center (CVE-2026-20316), urging immediate patching or offline action.

By Content Team

Jul 31, 2026

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CISA is warning organizations about a critical zero-day vulnerability in Cisco's Secure Firewall Management Center (FMC), tracked as CVE-2026-20316. The flaw stems from a hard-coded password baked into the software, letting unauthenticated attackers log in with low-privilege access — no credentials needed.

Once inside, attackers can view firewall policies, security rules, and event logs, potentially setting the stage for deeper network compromise. CISA is urging immediate patching under BOD 26-04 guidelines. If no fix is available, they recommend taking the product offline entirely. Organizations should also audit FMC access logs now for signs of unauthorized logins.

Source: Cybersecurity News

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