High [CVE-2026-111107] NULL pointer dereference vulnerability in WatchGuard Fireware OS’s management interface allows a remote, unauthenticated attacker with network access to the management interface to crash the management service by sending a specially crafted login request
This high-severity WatchGuard advisory covers CVE-2026-111107 affecting Fireware OS.
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Summary
A NULL pointer dereference vulnerability in WatchGuard Fireware OS’s management interface allows a remote, unauthenticated attacker with network access to the management interface to crash the management service by sending a specially crafted login request.
Repeated exploitation terminates all active administrator sessions and in-progress management operations and can prevent management of the device. Traffic processing is not affected.
- Fireware OS 2025.1 before 2026.4
- Fireware OS 12.0 before 12.12.4
- Fireware OS 12.0 before 12.5.22
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
- 2026.4
- 12.12.4
- 12.5.22
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Mitigation
Upgrade to a fixed release: 2026.4, 12.12.4, 12.5.22. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
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- CVE-2026-103593Oct 27, 2026Fireware OS Stack Buffer Overflow in Logging Service Allows Remote Code Execution
- CVE-2026-113881Oct 27, 2026Fireware OS Stack Buffer Overflow in VPN Network Access Enforcement Allows Unprivileged
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