Secure Firewall Management Center
CVE-2026-20343: Cisco Secure Firewall Management Center Software Information Disclosure and Disk Denial of Service Vulnerability
A vulnerability in a critical API for Cisco Secure FMC Software could allow an unauthenticated, remote attacker to download sensitive files and use unbounded disk space.
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) 7.3 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.3 | 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) 7.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.4 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.3 | 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) 7.4 | 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) 7.6 | See the advisory |
| Cisco Secure Firewall Management Center (FMC) 7.4 | 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) 7.6 | 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) 7.6 | 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 |
| 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) 7.4 | 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 |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A vulnerability in a critical API for Cisco Secure FMC Software could allow an unauthenticated, remote attacker to download sensitive files and use unbounded disk space.
This vulnerability exists because a critical API lacks authentication. An attacker could exploit this vulnerability by repeatedly invoking the API. A successful exploit could allow the attacker to download sensitive files that should be restricted and consume disk space so the device could become unresponsive, causing a DoS condition.
Exploitation
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.