CVE-2020-27770

Name: CVE-2020-27770
Creator: NVD / NIST
Published: 2020-12-04T15:15:10.707+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 1.13%

Last modified Jun 17, 2026

CVE-2020-27770 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 1.13% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS Probability

1.13%

62.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Imagemagick	Imagemagick	< 6.9.10-68
Imagemagick	Imagemagick	>= 7.0.0-0, < 7.0.8-68
Debian	Debian Linux	9.0

References

https://bugzilla.redhat.com/show_bug.cgi?id=1894691Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00030.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/03/msg00008.html
https://bugzilla.redhat.com/show_bug.cgi?id=1894691Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00030.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/03/msg00008.html

Timeline

Published: Dec 4, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-27770?

How severe is CVE-2020-27770?

CVE-2020-27770 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 1.13% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27770?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-27770?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST