Critical [CVE-2026-103594] stack-based buffer overflow vulnerability in Fireware OS's WireGuard configuration processing allows a remote attacker that has man-in-the-middle TLS-decrypted access between the Firebox and WatchGuard Cloud to create a Denial of Service condition and potentially execute arbitrary code by tampering with a FireCloud Gateway configuration payload
This critical-severity WatchGuard advisory covers CVE-2026-103594 affecting Fireware OS.
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Summary
A stack-based buffer overflow vulnerability in Fireware OS's WireGuard configuration processing allows a remote attacker that has man-in-the-middle TLS-decrypted access between the Firebox and WatchGuard Cloud to create a Denial of Service condition and potentially execute arbitrary code by tampering with a FireCloud Gateway configuration payload.
- Fireware OS 2026.2 before 2026.4
- Fireware OS 12.12 before 12.12.4
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
- 2026.4
- 12.12.4
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
Mitigation
Upgrade to a fixed release: 2026.4, 12.12.4. 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 2 days ago·verify at source
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