CVE-2020-12422

Name: CVE-2020-12422
Creator: NVD / NIST
Published: 2020-07-09T15:15:12.13+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.94%

Last modified Jun 17, 2026

CVE-2020-12422 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. In non-standard configurations, a JPEG image created by JavaScript could have caused an internal variable to overflow, resulting in an out of bounds write, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 78.. EPSS estimates a 1.94% chance of exploitation in the next 30 days.

Description

In non-standard configurations, a JPEG image created by JavaScript could have caused an internal variable to overflow, resulting in an out of bounds write, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 78.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

1.94%

77.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 78.0
Opensuse	Leap	15.1
Opensuse	Leap	15.2

References

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00049.htmlMailing List, Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1450353Issue Tracking, Vendor Advisory
https://security.gentoo.org/glsa/202007-10Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-24/Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00049.htmlMailing List, Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1450353Issue Tracking, Vendor Advisory
https://security.gentoo.org/glsa/202007-10Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-24/Vendor Advisory

Timeline

Published: Jul 9, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-12422?

How severe is CVE-2020-12422?

CVE-2020-12422 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.94% probability of exploitation in the next 30 days.

How do I fix CVE-2020-12422?

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-2020-12422?

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

Scan your code now

Source: NVD / NIST