CVE-2026-113881 PUBLISHED

Fireware OS Stack Buffer Overflow in VPN Network Access Enforcement Allows Unprivileged Code Execution

Assigner: WatchGuard
Reserved: 20.10.2026 Published: 27.10.2026 Updated: 27.10.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 6.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	WatchGuard
Product	Fireware OS
Versions	Default: unaffected affected from 2025.1 to 2026.4 (excl.) affected from 12.9 to 12.12.4 (excl.)

Affected Configurations

This vulnerability affects Firebox deployments with Network Access Control enabled for a Mobile VPN.

Exploits

WatchGuard is not aware of any exploitation of this vulnerability in the wild.

Solutions

Fireware OS 2026.4, Fireware OS 12.12.4

Credits

WatchGuard AI Security Research finder

References

https://psirt.watchguard.com/CVE-2026-113881

Problem Types

CWE-121 CWE
CWE-129 CWE