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No exploitation reportedFix available

CVE-2021-23191

No exploitation reported by the sources we read.

  • Published2022-03-02
  • WeaknessCWE-476

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2022-03-0223:15CVE publishedNVD

Versions per branch

NVD
Htmldoc project htmldoc
BranchAffectedFixed in
1.9≤ 1.9.12no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • htmldocUbuntu:Pro:20.04:LTSall versions · fixed in 1.9.7-1ubuntu0.3+esm1
  • htmldocUbuntu:Pro:18.04:LTSall versions · fixed in 1.9.2-1ubuntu0.2+esm1
  • htmldocUbuntu:Pro:16.04:LTSall versions · fixed in 1.8.27-8ubuntu1.1+esm2
  • htmldocUbuntu:Pro:14.04:LTSall versions · fixed in 1.8.27-8ubuntu1+esm3
  • htmldocMageia:8all versions · fixed in 1.9.8-1.2.mga8
  • htmldocMageia:7all versions · fixed in 1.9.3-2.3.mga7
  • htmldocDebian:14all versions · fixed in 1.9.11-4
  • htmldocDebian:13all versions · fixed in 1.9.11-4

3 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-23191 Red Hat Product Security

    htmldoc: null pointer dereference in function image_load_jpeg()

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.17.8read 2026-10-23
  • NVDCVSS 2.06.8read 2026-10-23
  • CNAweakness (CWE)CWE-476known since 2026-10-23
  • NVDweakness (CWE)CWE-476read 2026-10-23
  • FIRST EPSSEPSS score1.1 %2026-11-09
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2022-03-02
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-rh6g-g88g-qmfg

Frequently asked questions

What is 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.

Is CVE-2021-23191 actively exploited?

Active exploitation of CVE-2021-23191 has not been confirmed. Its EPSS score was 1.1% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-23191?

CVE-2021-23191 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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