Deserialization of Untrusted Data in Fireware OS - CVE-2026-13371

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Main Vulnerability Database Vulnerabilities #VU136888

Deserialization of Untrusted Data in Fireware OS - CVE-2026-13371

Published: July 3, 2026


Vulnerability identifier: #VU136888
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-13371
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: WatchGuard
Affected software:
Fireware OS

Detailed vulnerability description

The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to unsafe deserialization in the put_data endpoint when handling attacker-supplied input. A remote privileged user can send malformed or crafted data to cause a denial of service.


How to mitigate CVE-2026-13371

Install security update from vendor's website.

Sources