CVE-2025-6999

MEDIUM

WatchGuard Fireware OS <12.11.2 - XSS

Title source: llm

Description

An HTTP Request Smuggling [CWE-444] vulnerability in the Authentication portal of WatchGuard Fireware OS allows a remote attacker to evade request parameter sanitation and perform a reflected self-Cross-Site Scripting (XSS) attack.This issue affects Fireware OS: from 12.0 through 12.11.2.

References (1)

[Vendor Advisory] https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00014

Scores

CVSS v4 6.9

EPSS 0.0016

EPSS Percentile 36.9%

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-444

Status published

Products (1)

WatchGuard/Fireware OS 12.0 - 12.11.2

Published Sep 15, 2025

Tracked Since Feb 18, 2026