What is CVE-2021-20176?

CVE-2021-20176 is a medium-severity vulnerability in Imagemagick, classified under Divide By Zero. CVSS score: 5.5/10. Published 2021-02-06.

How severe is CVE-2021-20176?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Imagemagick

CVE-2021-20176

A divide-by-zero flaw was found in ImageMagick 6.9.11-57 and 7.0.10-57 in gem.c. This flaw allows an attacker who submits a crafted file that is processed by ImageMagick to trigger undefined behavior through a division by zero. The highest threat from this vulnerability is to system availability.

Published 2021-02-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.009 (58.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.9% 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

Imagemagick
Debian Linux — versions 9.0
Imagemagick — versions 6.9.11-57, 7.0.10-57

Weakness classification (CWE)

CWE-369 — Divide By Zero

References

bugzilla.redhat.com/show_bug.cgi (Issue Tracking)
lists.debian.org/debian-lts-announce/2021/03/msg00030.html (mailing-list, Mailing List, Third Party Advisory)
lists.debian.org/debian-lts-announce/2023/05/msg00020.html (mailing-list)

Frequently asked questions

What is CVE-2021-20176?: CVE-2021-20176 is a medium-severity vulnerability in Imagemagick, classified under Divide By Zero. CVSS score: 5.5/10. Published 2021-02-06.
How severe is CVE-2021-20176?: Medium severity. CVSS v3 base score is 5.5 out of 10.