Firebox and Fireware OS
CVE-2025-0178: WatchGaurd Firebox Host Header Injection Vulnerability
An Improper Input Validation vulnerability in WatchGuard Fireware OS allows an attacker with network access to manipulate the value of the HTTP Host header in requests sent to the Web UI.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Fireware OS (Default) 12.0 | 12.11.1 or later |
| Fireware OS (T15/T35) 12.0 | 12.5.13 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
An Improper Input Validation vulnerability in WatchGuard Fireware OS allows an attacker with network access to manipulate the value of the HTTP Host header in requests sent to the Web UI. An attacker could exploit this vulnerability to redirect users to malicious websites, poison the web cache, or inject malicious JavaScript into responses sent by the Web UI.
Exploitation
WatchGuard is not aware of any exploitation of this vulnerability in the wild.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.