WatchGuard FireWare OS cli Token Parser Stack-based Buffer Overflow Remote Code Execution Vulnerability

July 29th, 2026
ZDI-26-499 ZDI-CAN-31459

CVE ID

CVE-2026-13053

CVSS Score

4.7 AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L

Affected Vendors

WatchGuard

Affected Products

FireWare OS

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of WatchGuard FireWare OS. Authentication is required to exploit this vulnerability.

The specific flaw exists within the handling of CLI commands. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the nobody user.

Additional Details

WatchGuard has issued an update to correct this vulnerability. More details can be found at:
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00030

Disclosure Timeline

  • 2026-05-22 - Vulnerability reported to vendor
  • 2026-07-29 - Coordinated public release of advisory
  • 2026-07-29 - Advisory Updated

Credit

Nicholas Zubrisky (@NZubrisky) of TrendAI Research

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