Medium [CVE-2026-81851] Fireware OS Heap-Based Buffer Overflow in iked Allows Denial of Service
This medium-severity WatchGuard advisory covers CVE-2026-81851 affecting Fireware OS.
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Summary
A heap-based buffer overflow vulnerability in Fireware OS's iked process allows an authenticated administrator to crash the IKE daemon (iked), resulting in a denial of service, by saving a specially crafted configuration.
- Fireware OS 2025.0 before 2026.2.1
- Fireware OS 12.0 before 12.12.1
- Fireware OS 12.0 before 12.11.9
- Fireware OS 12.0 before 12.5.18
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
- 2026.2.1
- 12.12.1
- 12.11.9
- 12.5.18
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation
Upgrade to a fixed release: 2026.2.1, 12.12.1, 12.11.9, 12.5.18. 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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