Critical [CVE-2026-13086] stack-based buffer overflow in the epm (Endpoint Protection Manager) service used by the deprecated Mobile Security feature in WatchGuard Fireware OS allows an unauthenticated remote attacker to execute arbitrary code
This critical-severity WatchGuard advisory covers CVE-2026-13086 affecting Fireware OS.
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Summary
A stack-based buffer overflow in the epm (Endpoint Protection Manager) service used by the deprecated Mobile Security feature in WatchGuard Fireware OS allows an unauthenticated remote attacker to execute arbitrary code.
- Fireware OS 2025.0 before 2026.2.2
- Fireware OS 12.0 before 12.12.2
- Fireware OS 2026.3 before 2026.3.1
- Fireware OS 12.0 before 12.5.20
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- 2026.2.2
- 12.12.2
- 2026.3.1
- 12.5.20
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation
Upgrade to a fixed release: 2026.2.2, 12.12.2, 2026.3.1, 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 2 months ago·verify at source
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