Medium [CVE-2026-13371] WatchGuard Firebox Management Web UI Denial of Service via Unsafe Deserialization
This medium-severity WatchGuard advisory covers CVE-2026-13371 affecting Fireware OS.
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Summary
An authenticated administrator can trigger a denial-of-service condition in the Fireware Management Web UI by sending malformed or crafted data to the put_data endpoint, which performs unsafe deserialization of the attacker-supplied input.
Affected product named by the advisory: Fireware OS.
- Fireware OS 2025.1 before 2026.2.1
- Fireware OS 12.0 before 12.12.1
- Fireware OS 12.0 before 12.5.19
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
- 2026.2.1
- 12.12.1
- 12.5.19
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation
Upgrade to a fixed release: 2026.2.1, 12.12.1, 12.5.19. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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