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Fencer Vulns
medium 5.5

CVE-2021-20245 json

A flaw was found in ImageMagick in coders/webp.c.

published 2021-03-09 5 y ago modified 2026-07-30 3 mo ago also EUVD-2021-7684 , JLSEC-2026-882

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits
0
none known

Summary

A flaw was found in ImageMagick in coders/webp.c. An attacker who submits a crafted file that is processed by ImageMagick could trigger undefined behavior in the form of math division by zero. The highest threat from this vulnerability is to system availability.

Patch / fix

  • julia ImageMagick_jll 6.9.12+0
  • imagemagick imagemagick 6.9.11-62, 7.0.10-62
  • imagemagick Debian 14, Debian 13, Debian 12 8:6.9.11.60+dfsg-1.5

debian advisories DEBIAN-CVE-2021-20245

  • imagemagick Ubuntu Pro 22.04 LTS 8:6.9.11.60+dfsg-1.3ubuntu0.22.04.1+esm1

ubuntu advisories UBUNTU-CVE-2021-20245

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

  • imagemagick Alpine 3.13 7.0.11.13-r0
  • imagemagick Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 7.0.11.1-r0

alpine advisories ALPINE-CVE-2021-20245

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • imagemagick Arch Linux 7.0.10.62-1

arch linux advisories AVG-1579

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-2021-20245 updated cvss 5.5

ImageMagick: Division by zero in WriteAnimatedWEBPImage() in coders/webp.c

  • Red Hat Enterprise Linux 6 ImageMagick, ImageMagick-c++, ImageMagick-perl Red Hat Enterprise Linux 7 ImageMagick, ImageMagick-c++, ImageMagick-perl
    affected: no fix planned “Out of support scope”

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

1.21% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 7.1 AV:N/AC:M/Au:N/C:N/I:N/A:C
OSV 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia ImageMagick_jll
<6.9.12+0
6.9.12+0

Affected products

  • n/a ImageMagick

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.