CVE-2026-20131 — Cisco Secure Firewall Management Center (FMC): Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data Vulnerability
CVE-2026-20131 — 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 attacker to execute arbitrary
What This Means For You
- CISA has confirmed active exploitation — immediate patching required.
- Known ransomware campaign usage — elevated risk for all organizations.
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-20131 | Deserialization | Cisco Secure Firewall Management Center (FMC) Software, Cisco Security Cloud Control (SCC) Firewall Management, web-based management interface, deserialization of untrusted data vulnerability |
| CVE-2026-20131 | RCE | Cisco Secure Firewall Management Center (FMC) Software, Cisco Security Cloud Control (SCC) Firewall Management, web-based management interface, allows unauthenticated, remote attacker to execute arbitrary Java code as root |
Source & Attribution
| Source Platform | CISA |
| Channel | CISA KEV |
| Published | March 19, 2026 at 14:00 UTC |
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