What is CVE-2020-27770?

CVE-2020-27770 is a medium-severity vulnerability in Imagemagick, classified under Integer Overflow or Wraparound. CVSS score: 5.5/10. Published 2020-12-04.

How severe is CVE-2020-27770?

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

Integer overflow in Imagemagick

CVE-2020-27770

Due to a missing check for 0 value of `replace_extent`, it is possible for offset `p` to overflow in SubstituteString(), causing potential impact to application availability. This could be triggered by a crafted input file that is processed by ImageMagick. This flaw affects ImageMagick versions prior to 7.0.8-68.

Vulnerability class: Integer Overflow

Published 2020-12-04 · 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: 0.011 (65.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Imagemagick
Debian Linux — versions 9.0
Imagemagick — versions ImageMagick 7.0.8-68

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

bugzilla.redhat.com/show_bug.cgi (Exploit, Patch, Third Party Advisory, 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/2023/03/msg00008.html (mailing-list)

Frequently asked questions

What is CVE-2020-27770?: CVE-2020-27770 is a medium-severity vulnerability in Imagemagick, classified under Integer Overflow or Wraparound. CVSS score: 5.5/10. Published 2020-12-04.
How severe is CVE-2020-27770?: Medium severity. CVSS v3 base score is 5.5 out of 10.