CVE-2026-20131
Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability
Description
A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to execute arbitrary Java code as root on an affected device. This vulnerability is due to insecure deserialization of a user-supplied Java byte stream. An attacker could exploit this vulnerability by sending a crafted serialized Java object to the web-based management interface of an affected device. A successful exploit could allow the attacker to execute arbitrary code on the device and elevate privileges to root. Note: If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced.
Weakness: CWE-502
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco Secure Firewall Management Center Check your version | Network & Security Management | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco Secure Firewall Management Center (FMC)
Vendor advisory
Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability
Cisco’s rating: Critical (advisory CVSS 10.0) · Published Mar 4, 2026 · updated Mar 25, 2026 (revision 1.2)
Bug ID: CSCwt14636
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from