---
id: CVE-2025-59151
title: >-
  Pi-hole Admin Interface is a web interface for managing Pi-hole, a
  network-level advertisement and internet tracker blocking application
summary: >-
  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. Whe…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L'
cwe:
  - CWE-93
  - CWE-113
vendor: pi-hole
product: web_interface
affected:
  - web_interface < 6.3
patched:
  - web_interface 6.3
published: '2025-10-27'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T11:10:00.250'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-59151'
references:
  - url: 'https://github.com/pi-hole/web/security/advisories/GHSA-5v79-p56f-x7c4'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00436
epssPercentile: 0.35852
ingestedAt: '2026-10-08T11:31:27.647Z'
---

## Overview

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

- `web_interface < 6.3`

## Remediation

Upgrade past the affected range:

- `web_interface 6.3`