CVE-2026-113881
Fireware OS Stack Buffer Overflow in VPN Network Access Enforcement Allows Unprivileged Code Execution
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.
Fixes and workarounds
Fix
Fireware OS 2026.4, Fireware OS 12.12.4
Source: CNA: WatchGuardAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Fireware OS WatchGuard Platforms: Default |
≥ 2025.1; < 2026.4 (affected, custom) ≥ 12.9; < 12.12.4 (affected, custom) Other versions: unaffected |
CNA: WatchGuard |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 6.1 medium |
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N | CNA: WatchGuard |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://psirt.watchguard.com/CVE-2026-113881CNA: WatchGuard · vendor-advisory
For agents and automation
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