CVE-2021-23180

Name: CVE-2021-23180
Creator: NVD / NIST
Published: 2022-03-02T23:15:08.283+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 1.27%

Last modified Jun 17, 2026

CVE-2021-23180 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A flaw was found in htmldoc in v1.9.12 and before. Null pointer dereference in file_extension(),in file.c may lead to execute arbitrary code and denial of service.. EPSS estimates a 1.27% chance of exploitation in the next 30 days.

Description

A flaw was found in htmldoc in v1.9.12 and before. Null pointer dereference in file_extension(),in file.c may lead to execute arbitrary code and denial of service.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

1.27%

66.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Htmldoc Project	Htmldoc	<= 1.9.12

References

https://bugzilla.redhat.com/show_bug.cgi?id=1967041Issue Tracking, Patch, Third Party Advisory
https://github.com/michaelrsweet/htmldoc/commit/19c582fb32eac74b57e155cffbb529377a9e751aPatch, Third Party Advisory
https://github.com/michaelrsweet/htmldoc/issues/418Exploit, Issue Tracking, Third Party Advisory
https://ubuntu.com/security/CVE-2021-23180Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1967041Issue Tracking, Patch, Third Party Advisory
https://github.com/michaelrsweet/htmldoc/commit/19c582fb32eac74b57e155cffbb529377a9e751aPatch, Third Party Advisory
https://github.com/michaelrsweet/htmldoc/issues/418Exploit, Issue Tracking, Third Party Advisory
https://ubuntu.com/security/CVE-2021-23180Third Party Advisory

Timeline

Published: Mar 2, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23180?

A flaw was found in htmldoc in v1.9.12 and before. Null pointer dereference in file_extension(),in file.c may lead to execute arbitrary code and denial of service.

How severe is CVE-2021-23180?

CVE-2021-23180 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.27% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23180?

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-2021-23180?

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

Scan your code now

Source: NVD / NIST