What is CVE-2021-20313?

CVE-2021-20313 is a high-severity vulnerability in Imagemagick, classified under Information Disclosure. CVSS score: 7.5/10. Published 2021-05-11.

How severe is CVE-2021-20313?

High severity. CVSS v3 base score is 7.5 out of 10.

Information disclosure in Imagemagick

CVE-2021-20313

A flaw was found in ImageMagick in versions before 7.0.11. A potential cipher leak when the calculate signatures in TransformSignature is possible. The highest threat from this vulnerability is to data confidentiality.

Vulnerability class: Information Disclosure

Published 2021-05-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.018 (77.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Imagemagick
Debian Linux — versions 9.0
Imagemagick — versions ImageMagick 7.0.11

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
lists.debian.org/debian-lts-announce/2021/06/msg00000.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-2021-20313?: CVE-2021-20313 is a high-severity vulnerability in Imagemagick, classified under Information Disclosure. CVSS score: 7.5/10. Published 2021-05-11.
How severe is CVE-2021-20313?: High severity. CVSS v3 base score is 7.5 out of 10.