VulnerabilityALERT Critical

CVE-2026-20131: Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data Vulnerability

Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management contain a deserialization of untrusted data vulnerability in the web-based management interface that could allow an unauthenticated, remote attack...

Impact

CISA lists CVE-2026-20131 as known exploited in the wild for Cisco Secure Firewall Management Center (FMC). Ransomware campaign use: Known. Federal remediation due date: 2026-03-22.

Recommended Action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Published: 3/19/2026, 12:00:00 AMSource: CISA Known Exploited Vulnerabilities CatalogTags: CVE-2026-20131, Cisco, Secure Firewall Management Center (FMC), CISA KEV, CWE-502