What’s Vulnerable › Vulnerabilities
CVE-2025-59151: Pi-hole Admin Interface vulnerable to HTTP response header injection via CRLF injection
- Severity: high (CVSS 8.2 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2025-10-27 · updated 2026-10-08
- Weakness: CWE-93
Description
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.
Affected products
- pi-hole web: before 6.3 — fixed in 6.3
How to fix
Upgrade to a fixed version: pi-hole web 6.3. Check the vendor advisory for mitigations.
References
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