CVE-2026-20079 — Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel Vulnerability
September 9, 2026
Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel Vulnerability
Affected vendor/product: Cisco Secure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall Management
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.