What is CVE-2020-21679?

CVE-2020-21679 is a medium-severity vulnerability in Graphicsmagick, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2023-08-22.

How severe is CVE-2020-21679?

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

Buffer overflow in Graphicsmagick

CVE-2020-21679

Buffer Overflow vulnerability in WritePCXImage function in pcx.c in GraphicsMagick 1.4 allows remote attackers to cause a denial of service via converting of crafted image file to pcx format.

Vulnerability class: Buffer Overflow

Published 2023-08-22 · 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: 0.004 (34.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 34.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Graphicsmagick — versions 1.4

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

sourceforge.net/p/graphicsmagick/bugs/619/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-21679?: CVE-2020-21679 is a medium-severity vulnerability in Graphicsmagick, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2023-08-22.
How severe is CVE-2020-21679?: Medium severity. CVSS v3 base score is 5.5 out of 10.