Overview
This article details CVE-2025-13939, a Stored Cross-Site Scripting (XSS) vulnerability affecting the Gateway Wireless Controller module in WatchGuard Fireware OS. This vulnerability allows an attacker to inject malicious scripts into web pages viewed by other users, potentially leading to account compromise, data theft, or other malicious activities. The vulnerability affects multiple versions of Fireware OS, highlighting the importance of immediate patching.
Technical Details
CVE-2025-13939 is a Stored XSS vulnerability, meaning the malicious script is stored on the server (WatchGuard Fireware OS) and executed when other users access the affected web page. The vulnerability stems from improper neutralization of user-supplied input during web page generation within the Gateway Wireless Controller module. By injecting malicious JavaScript code into a field that isn’t properly sanitized, an attacker can have that code executed in the browsers of other users who interact with the affected area of the Fireware OS management interface.
Affected Versions:
- Fireware OS 11.7.2 up to and including 11.12.4+541730
- Fireware OS 12.0 up to and including 12.11.4
- Fireware OS 12.5 up to and including 12.5.13
- Fireware OS 2025.1 up to and including 2025.1.2
CVSS Analysis
The severity of CVE-2025-13939 is currently listed as N/A, and a CVSS score has not been assigned. However, given that it’s a Stored XSS vulnerability, the potential impact can be significant. A successful exploit could lead to privilege escalation, session hijacking, and defacement of the web interface.
Possible Impact
The exploitation of CVE-2025-13939 can have serious consequences:
- Account Compromise: An attacker could steal administrator credentials or hijack user sessions.
- Data Theft: Sensitive information stored within the Fireware OS management interface could be accessed and exfiltrated.
- Malware Distribution: The injected script could redirect users to malicious websites or initiate the download of malware.
- Configuration Manipulation: An attacker could modify firewall rules, potentially opening the network to further attacks.
- Denial of Service: By injecting scripts that cause errors, an attacker might trigger a denial-of-service condition on the Fireware OS management interface.
Mitigation and Patch Steps
WatchGuard has released patches to address this vulnerability. It is strongly recommended that users running the affected versions of Fireware OS upgrade to the latest version as soon as possible.
- Upgrade Fireware OS: Apply the latest available patches provided by WatchGuard. Consult the WatchGuard Security Advisory (WGSA-2025-00024) for specific upgrade instructions.
- Monitor for Suspicious Activity: Keep an eye on your network traffic and Fireware OS logs for any unusual activity that might indicate exploitation attempts.
- Web Application Firewall (WAF): If applicable, consider using a WAF to filter out malicious requests that could exploit this XSS vulnerability until the patch is applied.
