CVE-2021-32706
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 60.2%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 60.18% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-94
- Affected
- pi-hole/pi-hole
- Source
- security-advisories@github.com
EPSS 60.2% since 3 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/pi-hole/AdminLTE/releases/tag/v5.5.1Release Notes, Third Party Advisory
- https://github.com/pi-hole/AdminLTE/security/advisories/GHSA-5cm9-6p3m-v259Exploit, Third Party Advisory
- https://github.com/pi-hole/AdminLTE/releases/tag/v5.5.1Release Notes, Third Party Advisory
- https://github.com/pi-hole/AdminLTE/security/advisories/GHSA-5cm9-6p3m-v259Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.