CVE-2025-59151
HighCVSS 8.2Exploitation Probability (EPSS)
Low risk36th percentile - higher than 36% of all known CVEs
Summary
Pi-hole Admin Interface before version 6.3 is vulnerable to CRLF injection. When a request is made to a file ending with the .lp extension, the application performs a redirect without proper input sanitization. An attacker can inject carriage return and line feed characters (%0d%0a) to manipulate both headers and content of the HTTP response, enabling injection of arbitrary HTTP response headers, potentially leading to session fixation, cache poisoning, and weakening or bypassing browser-based security mechanisms such as CSP or X-XSS-Protection.
Risk Assessment
An attacker can hijack user sessions, poison browser caches, and weaken XSS protections, threatening the security of the entire Pi-hole infrastructure.
Recommendation
Immediately update Pi-hole Admin Interface to version 6.3 or later, which includes a fix for the CRLF injection vulnerability.
Other vulnerabilities in Pi-hole Admin Interface
See all- CVE-2025-53533Medium
Pi-hole Admin Interface versions 6.2.1 and earlier are vulnerable to reflected cross-site scripting (XSS) via a malformed URL path. The 404 error page includes the requested path in the class attribute of the body tag without proper sanitization or escaping.
- CVE-2025-32785Medium
Pi-hole Admin Interface versions prior to 6.3 are vulnerable to cross-site scripting (XSS) via the Address field in the Subscribed Lists group management section. An authenticated user can inject malicious JavaScript that executes when another user navigates to the Tools section and performs a gravity database update. The vulnerability is patched in version 6.3.
Original NVD description (English source)
Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level advertisement and internet tracker blocking application. Pi-hole Admin Interface before 6.3 is vulnerable to Carriage Return Line Feed (CRLF) injection. When a request is made to a file ending with the .lp extension, the application performs a redirect without properly sanitizing the input. An attacker can inject carriage return and line feed characters (%0d%0a) to manipulate both the headers and the content of the HTTP response. This enables the injection of arbitrary HTTP response headers, potentially leading to session fixation, cache poisoning, and the weakening or bypassing of browser-based security mechanisms such as Content Security Policy or X-XSS-Protection. This vulnerability is fixed in 6.3.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS