High [CVE-2026-78008] Fireware OS Authenticated Buffer Overflow in wgagent
This high-severity WatchGuard advisory covers CVE-2026-78008 affecting Fireware OS.
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Summary
A buffer overflow vulnerability in the WatchGuard Fireware OS Management Web UI allows an authenticated administrator with network access to cause a denial of service (DoS) condition or potentially 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
Official advisory · high-confidence parse· fetched 54 minutes ago·verify at source
- 2026.2.2
- 12.12.2
- 12.5.20
Official advisory · high-confidence parse· fetched 54 minutes ago·verify at source
Mitigation
Upgrade to a fixed release: 2026.2.2, 12.12.2, 12.5.20. 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 54 minutes ago·verify at source
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