VULNERABILITY INTELLIGENCE

CVE-2021-32706

CVSS score7.6 HIGH

EPSS probability60.18%

CISA KEVNot currently listed

Published2021-08-04

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H

Description

Pi-hole's Web interface provides a central location to manage a Pi-hole instance and review performance statistics. Prior to Pi-hole Web interface version 5.5.1, the `validDomainWildcard` preg_match filter allows a malicious character through that can be used to execute code, list directories, and overwrite sensitive files. The issue lies in the fact that one of the periods is not escaped, allowing any character to be used in its place. A patch for this vulnerability was released in version 5.5.1.

Weakness classification

security-advisories@github.com: CWE-94
nvd@nist.gov: NVD-CWE-Other

Primary references

security-advisories@github.com — Release Notes, Third Party Advisory
security-advisories@github.com — Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Third Party Advisory