Cisco Secure FMC Zero-Day Exploited in the Wild

The vulnerability tracked as CVE-2026-20316 can be exploited by a remote, unauthenticated attacker to log into affected devices. The post Cisco Secure FMC Zero-Day Exploited in the Wild appeared first on SecurityWeek .

The article describes a zero-day vulnerability (CVE-2026-20316) in Cisco Secure Firewall Management Center (FMC) where static, hard-coded credentials for a low-privileged account in the web interface allow a remote, unauthenticated attacker to log into affected devices and access sensitive data.[1][2][3][4] Multiple sources confirm active exploitation in the wild and note that administrators cannot change these credentials, making patching the only effective remediation path.[2][3][4] From a RealGround perspective, this highlights AI supply chain risk: AI agents and LLM-backed security workflows that rely on or integrate with FMC data, logs, or configurations could be fed tampered or exfiltrated firewall and network information, undermining monitoring, automated decision-making, and incident response. Organizations should treat FMC and similar management appliances as critical components in their AI supply chain, maintain a detailed SBOM and dependency inventory, and apply rapid patching combined with continuous red teaming to detect misuse of compromised management-plane data in downstream AI systems.