Home/CVE/Pi-hole's Web interface provides a central location to manage a Pi-hole instance and review performance statistics. Prio
CVE

CVE-2021-32706

Pi-hole's Web interface provides a central location to manage a Pi-hole instance and review performance statistics. Prio

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.

HIGH · CVSS 7.6 EPSS 0.61046
Act now
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 2% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-94Improper Control of Generation of Code ('Code Injection')
▤

Affected Products & Versions

1
pi-hole< 5.5.1
⚠

Public Exploits & PoCs

1
pocgithub.com · GHSA-5cm9-6p3m-v259github.com
◈

Detection Rules (IDS/IPS)

2
et-openET EXPLOIT PiHole Web Interface Regex Escape Leading to RCE Inbound M1 (CVE-2021-32706)attempted-admin
et-openET EXPLOIT PiHole Web Interface Regex Escape Leading to RCE Inbound M2 (CVE-2021-32706)attempted-admin
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
▣

Scoring & Timeline

7.6
HIGH · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD04 Aug 2021 · 06:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/pi-hole/AdminLTE/releases/tag/v5.5.1Release NotesThird Party Advisory
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