CVE-2020-8821

Name: CVE-2020-8821
Creator: NVD / NIST
Published: 2020-10-12T16:15:12.59+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 82.15%

Last modified Jun 17, 2026

CVE-2020-8821 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. An Improper Data Validation Vulnerability exists in Webmin 1.941 and earlier affecting the Command Shell Endpoint. A user may enter HTML code into the Command field and submit it. EPSS estimates a 82.15% chance of exploitation in the next 30 days.

Description

An Improper Data Validation Vulnerability exists in Webmin 1.941 and earlier affecting the Command Shell Endpoint. A user may enter HTML code into the Command field and submit it. Then, after visiting the Action Logs Menu and displaying logs, the HTML code will be rendered (however, JavaScript is not executed). Changes are kept across users.

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

82.15%

99.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Webmin	Webmin	<= 1.941

References

https://www.webmin.com/security.htmlVendor Advisory
https://www.webmin.com/security.htmlVendor Advisory

Timeline

Published: Oct 12, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-8821?

How severe is CVE-2020-8821?

CVE-2020-8821 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 82.15% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8821?

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-2020-8821?

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

Scan your code now

Source: NVD / NIST