CVE-2021-32706: Pi-Hole

High severity, CVSS 8.8. EPSS: 60.2% chance of exploitation in the next 30 days.

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.

Affected products

• Pi-hole Pi-Hole: before 5.5.1 (fixed in 5.5.1)

Published 2021-08-04. Last modified 2026-06-17.