Critical [CVE-2026-19313] heap overflow vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to execute arbitrary code by sending specially crafted network traffic
This critical-severity WatchGuard advisory covers CVE-2026-19313 affecting Fireware OS.
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Summary
An heap overflow vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to execute arbitrary code by sending specially crafted network traffic.
- Fireware OS 2025.0 before 2026.2.2
- Fireware OS 12.0 before 12.12.2
- Fireware OS 12.0 before 12.5.20
- Fireware OS 2026.3 before 2026.3.1
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- 2026.2.2
- 12.12.2
- 12.5.20
- 2026.3.1
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation
Upgrade to a fixed release: 2026.2.2, 12.12.2, 12.5.20, 2026.3.1. 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 months ago·verify at source
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