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WatchGuard VPN Client Flaw on Windows Enables SYSTEM‑Level Command Execution

WatchGuard has issued a critical security update for its Mobile VPN with IPSec client for Windows, addressing a privilege escalation vulnerability. This flaw, originating from the software by NCP engineering, enables local attackers to execute arbitrary…

JBy Jason FordFeb 05, 20261 min read

WatchGuard has issued a critical security update for its Mobile VPN with IPSec client for Windows, addressing a privilege escalation vulnerability. This flaw, originating from the software by NCP engineering, enables local attackers to execute arbitrary commands with elevated privileges on a compromised machine.

The vulnerability, identified as NCPVE-2025-0626 (WatchGuard Advisory WGSA-2026-00002), impacts versions 15.19 and earlier of the WatchGuard Mobile VPN with IPSec client for Windows. The issue is present in the MSI installer process used for software lifecycle management.

The vulnerability occurs during administrative actions such as the installation, update, or uninstallation of the VPN client. During these actions, command-line windows (cmd.exe) are temporarily launched under the SYSTEM account. In older Windows versions, these prompts are interactive, allowing a local attacker with low-level privileges to interact with them. This interaction could enable the execution of arbitrary commands or programs with SYSTEM rights, bypassing administrative protections and granting control over the endpoint.

WatchGuard has issued a critical security update for its Mobile VPN with IPSec client for Windows, addressing a privilege escalation vulnerability.
Jason Ford · Thehackingpost

The vulnerability is assigned a CVSS v4.0 score of 6.3 (Medium). Although the attack requires local access and user interaction with low privileges, the impact on System Confidentiality, Integrity, and Availability is significant if exploited.

WatchGuard and NCP have released a patch that resolves the issue in version 15.33 of the WatchGuard Mobile VPN with IPSec client for Windows. Security administrators and SOC teams are advised to update endpoints running vulnerable versions of the IPSec client to version 15.33 without delay. No workarounds are available, making patching the only effective mitigation.

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Based on reporting by GBHackers.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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