CVE-2020-15683

Name: CVE-2020-15683
Creator: NVD / NIST
Published: 2020-10-22T21:15:13.513+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.62%

Last modified Jun 17, 2026

CVE-2020-15683 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Mozilla developers and community members reported memory safety bugs present in Firefox 81 and Firefox ESR 78.3. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. EPSS estimates a 2.62% chance of exploitation in the next 30 days.

Description

Mozilla developers and community members reported memory safety bugs present in Firefox 81 and Firefox ESR 78.3. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.4, Firefox < 82, and Thunderbird < 78.4.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.62%

83.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 82.0
Mozilla	Firefox Esr	< 78.4
Mozilla	Thunderbird	< 78.4
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Opensuse	Leap	15.1
Opensuse	Leap	15.2

References

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00057.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00062.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00074.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00077.htmlMailing List, Third Party Advisory
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1576843%2C1656987%2C1660954%2C1662760%2C1663439%2C1666140Broken Link, Issue Tracking, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00027.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202010-08Third Party Advisory
https://www.debian.org/security/2020/dsa-4780Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-45/Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-46/Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-47/Release Notes, Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00057.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00062.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00074.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00077.htmlMailing List, Third Party Advisory
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1576843%2C1656987%2C1660954%2C1662760%2C1663439%2C1666140Broken Link, Issue Tracking, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00027.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202010-08Third Party Advisory
https://www.debian.org/security/2020/dsa-4780Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-45/Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-46/Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-47/Release Notes, Vendor Advisory

Timeline

Published: Oct 22, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-15683?

How severe is CVE-2020-15683?

CVE-2020-15683 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.62% probability of exploitation in the next 30 days.

How do I fix CVE-2020-15683?

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-2020-15683?

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

Scan your code now

Source: NVD / NIST