WatchGuard Firebox Authentication Portal Request Smuggling Vulnerability (CVE-2025-6999) | HOL Guard CVE

Medium · CVSS 6.9CVE-2025-6999

WatchGuard Firebox Authentication Portal Request Smuggling Vulnerability

Answer in brief

CVE-2025-6999 records a Medium severity (CVSS 6.9) vulnerability in WatchGuard Firebox Authentication Portal Request Smuggling Vulnerability. The current sources do not mark it as known exploited. The current feed maps WatchGuard/Fireware OS (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 15, 2025Updated Aug 10, 2026Source checked Sep 24, 2026First seen by HOL Aug 10, 2026Material review Aug 10, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.9
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps WatchGuard/Fireware OS (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
WatchGuard/Fireware OSgeneric	>=12.0 <12.11.3	12.11.3

Recommended response

Check inventory. Check lockfiles and deployed manifests for WatchGuard/Fireware OS.
Review the reported fix. Update WatchGuard/Fireware OS to 12.11.3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 15, 2025
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 10, 2026

Sources and claim methodology

Upstream source 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. WatchGuard does not believe there is a practical exploit chain with a meaningful security impact for this vulnerability.

Quoted source text, attributed separately from HOL analysis.