CVE-2026-20343
Cisco Secure Firewall Management Center Software Information Disclosure and Disk Denial of Service Vulnerability
Severity
High 7.5
CVSS 3.1
Exploited
Not listed
EPSS
0.004
38.5th percentile
Discovered by
Vendor
Vendor-published field
Published
Sep 16, 2026
Assigned by cisco
Description
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.
Weakness: CWE-306
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco Secure Firewall | Firewall / NGFW | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco Secure Firewall Management Center (FMC)