WatchGuard Fireware OS up to 12.5.12+701324/12.11 Header Host input validation

Summaryinfo

A vulnerability, which was classified as critical, has been found in WatchGuard Fireware OS up to 12.5.12+701324/12.11. Affected by this issue is some unknown functionality of the component Header Handler. The manipulation of the argument Host leads to input validation. This vulnerability is referenced as CVE-2025-0178. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in WatchGuard Fireware OS up to 12.5.12+701324/12.11 and classified as critical. This issue affects an unknown functionality of the component Header Handler. The manipulation of the argument Host with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Improper Input Validation vulnerability in WatchGuard Fireware OS allows an attacker 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. This issue affects Fireware OS: from 12.0 up to and including 12.11.

It is possible to read the advisory at watchguard.com. The identification of this vulnerability is CVE-2025-0178 since 01/02/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/02/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• WatchGuard

Name

• Fireware OS

Version

• 12.0
• 12.1
• 12.2
• 12.3
• 12.4
• 12.5
• 12.5.12+701324
• 12.6
• 12.7
• 12.8
• 12.9
• 12.10
• 12.11

License

• commercial

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion