CVE-2026-20131 — Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data Vulnerability
2026-03-19 • CISA Known Exploited Vulnerability
[event] 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 Java code as root on an affected device.
> AFFECTED SOFTWARE
| Field | Value |
|---|---|
| Vendor | Cisco |
| Product | Secure Firewall Management Center (FMC) |
| CWE | CWE-502 |
| CVE ID | CVE-2026-20131 |
| Date Added | 2026-03-19 |
| Due Date | 2026-03-22 |
| Ransomware Campaign | Known — this vulnerability has been leveraged in ransomware campaigns |
> MITIGATION
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Due Date: 2026-03-22