CVE-2021-32706

Name: CVE-2021-32706
Creator: NVD / NIST
Published: 2021-08-04T18:15:09.447+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 60.18%

Last modified Jun 17, 2026

CVE-2021-32706 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 60.18% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

60.18%

99.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-94

Affected Software

Vendor	Product	Versions
Pi-Hole	Pi-Hole	< 5.5.1

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

Timeline

Published: Aug 4, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-32706?

How severe is CVE-2021-32706?

CVE-2021-32706 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 60.18% probability of exploitation in the next 30 days.

How do I fix CVE-2021-32706?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-32706?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST