Medium [CVE-2025-6999] WatchGuard Firebox Authentication Portal Request Smuggling Vulnerability
This medium-severity WatchGuard advisory covers CVE-2025-6999 affecting Fireware OS.
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Summary
An HTTP Request Smuggling [CWE-444] vulnerability in the Authentication portal of WatchGuard Fireware OS allows a remote attacker to evade request parameter sanitation and perform a reflected self-Cross-Site Scripting (XSS) attack.
WatchGuard does not believe there is a practical exploit chain with a meaningful security impact for this vulnerability.
- Fireware OS 12.0 before 12.11.3
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
- 12.11.3
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation
Upgrade to a fixed release: 12.11.3. 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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