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Fencer Vulns
critical 9.8

CVE-2021-23165 json

A flaw was found in htmldoc before v1.9.12.

published 2022-03-16 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-10275

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.5%
EPSS 3.5% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

A flaw was found in htmldoc before v1.9.12. Heap buffer overflow in pspdf_prepare_outpages(), in ps-pdf.cxx may lead to execute arbitrary code and denial of service.

Patch / fix

  • htmldoc_project htmldoc 1.9.12
  • htmldoc Debian 14, Debian 13, Debian 12 1.9.11-4

debian advisories DEBIAN-CVE-2021-23165

  • htmldoc Ubuntu 18.04 LTS 1.9.2-1ubuntu0.2
  • htmldoc Ubuntu 20.04 LTS 1.9.7-1ubuntu0.3
  • htmldoc Ubuntu Pro 14.04 LTS 1.8.27-8ubuntu1+esm2
  • htmldoc Ubuntu Pro 16.04 LTS 1.8.27-8ubuntu1.1+esm1

ubuntu advisories UBUNTU-CVE-2021-23165

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • htmldoc Arch Linux 1.9.12-1

arch linux advisories AVG-1773

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-23165 updated cvss 8.6

htmldoc: heap-buffer-overflow in pspdf_prepare_outpages()

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.51% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=1967014 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/michaelrsweet/htmldoc/issues/413 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • n/a htmldoc

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.