CiscoCVE-2026-20343
Cisco Secure Firewall Management Center (FMC): denial of service
High7.5CVE-2026-20343 · Published Sep 16, 2026 · updated Sep 18, 2026
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Cisco Secure Firewall Management Center (FMC) Product | <= 7.3.0 | No fix yet |
| <= 7.3.1 | No fix yet | |
| <= 7.3.1.1 | No fix yet | |
| <= 7.4.0 | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-306
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