CVE-2020-35592

Name: CVE-2020-35592
Creator: NVD / NIST
Published: 2021-02-18T20:15:12.37+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.86%

Last modified Jun 17, 2026

CVE-2020-35592 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Pi-hole 5.0, 5.1, and 5.1.1 allows XSS via the Options header to the admin/ URI. A remote user is able to inject arbitrary web script or HTML due to incorrect sanitization of user-supplied data and achieve a Reflected Cross-Site Scripting attack against other users and steal the session cookie.. EPSS estimates a 0.86% chance of exploitation in the next 30 days.

Description

Pi-hole 5.0, 5.1, and 5.1.1 allows XSS via the Options header to the admin/ URI. A remote user is able to inject arbitrary web script or HTML due to incorrect sanitization of user-supplied data and achieve a Reflected Cross-Site Scripting attack against other users and steal the session cookie.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.86%

53.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Pi-Hole	Pi-Hole	5.0
Pi-Hole	Pi-Hole	5.1
Pi-Hole	Pi-Hole	5.1.1

References

https://discourse.pi-hole.net/c/announcements/5Release Notes, Vendor Advisory
https://n4nj0.github.io/advisories/pi-hole-multiple-vulnerabilities-i/Exploit, Third Party Advisory
https://discourse.pi-hole.net/c/announcements/5Release Notes, Vendor Advisory
https://n4nj0.github.io/advisories/pi-hole-multiple-vulnerabilities-i/Exploit, Third Party Advisory

Timeline

Published: Feb 18, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-35592?

How severe is CVE-2020-35592?

CVE-2020-35592 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.86% probability of exploitation in the next 30 days.

How do I fix CVE-2020-35592?

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-2020-35592?

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

Scan your code now

Source: NVD / NIST