What is CVE-2020-19609?

CVE-2020-19609 is a medium-severity vulnerability in Artifex Mupdf, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2021-07-21.

How severe is CVE-2020-19609?

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

Buffer overflow in Artifex Mupdf

CVE-2020-19609

Artifex MuPDF before 1.18.0 has a heap based buffer over-write in tiff_expand_colormap() function when parsing TIFF files allowing attackers to cause a denial of service.

Vulnerability class: Buffer Overflow

Published 2021-07-21 · 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: 0.010 (62.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Artifex Mupdf
Debian Linux — versions 9.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

bugs.ghostscript.com/show_bug.cgi (Patch, Issue Tracking, Vendor Advisory)
git.ghostscript.com/
bugs.ghostscript.com/show_bug.cgi (Exploit, Issue Tracking, Vendor Advisory)
lists.debian.org/debian-lts-announce/2021/09/msg00013.html (mailing-list, Third Party Advisory)

Frequently asked questions

What is CVE-2020-19609?: CVE-2020-19609 is a medium-severity vulnerability in Artifex Mupdf, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2021-07-21.
How severe is CVE-2020-19609?: Medium severity. CVSS v3 base score is 5.5 out of 10.