CVE-2025-6999 MEDIUM

CVE-2025-6999: WatchGuard Firebox Authentication Portal Request Smuggling Vulnerability

Vendor Watchguard
Product Fireware OS
Weakness CWE-444
Published September 15, 2025
Last update September 16, 2025
View on NVD All CVEs

CVSS base score

6.9/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

September 15, 2025 CVE published
September 16, 2025 Record updated