What is CVE-2021-23191?

CVE-2021-23191 is a high-severity vulnerability in Htmldoc Project, classified under NULL Pointer Dereference. CVSS score: 7.8/10. Published 2022-03-02.

How severe is CVE-2021-23191?

High severity. CVSS v3 base score is 7.8 out of 10.

NULL pointer dereference in Htmldoc Project

CVE-2021-23191

A security issue was found in htmldoc v1.9.12 and before. A NULL pointer dereference in the function image_load_jpeg() in image.cxx may result in denial of service.

Published 2022-03-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (64.3th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Htmldoc Project
Htmldoc — versions Fixed in htmldoc v1.9.12 and later.

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

github.com/michaelrsweet/htmldoc/issues/415 (Exploit, Third Party Advisory, Issue Tracking)
github.com/michaelrsweet/htmldoc/commit/369b2ea1fd0d0537ba707f20a2f047b6afd2fbdc (Patch, Third Party Advisory)
bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
ubuntu.com/security/CVE-2021-23191 (Third Party Advisory)

Frequently asked questions

What is CVE-2021-23191?: CVE-2021-23191 is a high-severity vulnerability in Htmldoc Project, classified under NULL Pointer Dereference. CVSS score: 7.8/10. Published 2022-03-02.
How severe is CVE-2021-23191?: High severity. CVSS v3 base score is 7.8 out of 10.