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.
Use CWE-94, Pi-Hole vendor hub and Pi-Hole product page to widen CVE-2021-32706 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2025-34087, CVE-2024-34361 and CVE-2024-28247 for nearby disclosures in the same product family.