What is CVE-2021-32491?

CVE-2021-32491 is a high-severity vulnerability in Djvulibre Project, classified under Integer Overflow or Wraparound. CVSS score: 7.8/10. Published 2021-06-24.

How severe is CVE-2021-32491?

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

Integer overflow in Djvulibre Project

CVE-2021-32491

A flaw was found in djvulibre-3.5.28 and earlier. An integer overflow in function render() in tools/ddjvu via crafted djvu file may lead to application crash and other consequences.

Vulnerability class: Integer Overflow

Published 2021-06-24 · 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: 0.009 (57.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: -0.000

Affected products

Djvulibre Project
Debian Linux — versions 10.0, 11.0
Djvulibre — versions djvulibre-3.5.28 and earlier

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
www.debian.org/security/2021/dsa-5032 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2021-32491?: CVE-2021-32491 is a high-severity vulnerability in Djvulibre Project, classified under Integer Overflow or Wraparound. CVSS score: 7.8/10. Published 2021-06-24.
How severe is CVE-2021-32491?: High severity. CVSS v3 base score is 7.8 out of 10.