Medium [CVE-2026-113881] Fireware OS Stack Buffer Overflow in VPN Network Access Enforcement Allows Unprivileged Code Execution
This medium-severity WatchGuard advisory covers CVE-2026-113881 affecting Fireware OS.
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Summary
A stack-based buffer overflow vulnerability in Fireware OS's VPN Network Access Enforcement process allows an authenticated mobile VPN user to create a denial of service condition and potentially execute arbitrary code as an unprivileged process by sending a specially crafted request.
- Fireware OS 2025.1 before 2026.4
- Fireware OS 12.9 before 12.12.4
Official advisory · high-confidence parse· fetched 3 days ago·verify at source
- 2026.4
- 12.12.4
Official advisory · high-confidence parse· fetched 3 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 3 days ago·verify at source
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