Secure Firewall Management Center
CVE-2026-20131: Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability
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.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Cisco Secure Firewall Management Center (FMC) 7.0 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.0 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.0 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.1 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 6.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.0 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 6.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.1 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.0 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 6.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.0 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.0 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.1 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.0 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.0 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 6.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.3 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.3 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.1 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.0 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.3 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 6.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.0 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.0 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 6.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.3 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.6 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.0 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.0 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.7 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.6 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.0 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.6 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.7 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.0 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.6 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.2 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.7 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.7 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.6 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 10.0 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.4 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
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.
Exploitation
In March 2026, the Cisco Product Security Incident Response Team (PSIRT) became aware of attempted exploitation of this vulnerability. Cisco continues to strongly recommend that customers upgrade to a fixed software release to remediate this vulnerability.
CISA lists this CVE as exploited in the wild since 19 Mar 2026, including in ransomware campaigns.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.