CVE-2020-6800

Name: CVE-2020-6800
Creator: NVD / NIST
Published: 2020-03-02T05:15:13.683+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.27%

Last modified Jun 17, 2026

CVE-2020-6800 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Mozilla developers and community members reported memory safety bugs present in Firefox 72 and Firefox ESR 68.4. 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 2.27% chance of exploitation in the next 30 days.

Description

Mozilla developers and community members reported memory safety bugs present in Firefox 72 and Firefox ESR 68.4. 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. In general, these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5, Firefox < 73, and Firefox < ESR68.5.

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

2.27%

80.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 73.0
Mozilla	Firefox Esr	< 68.5.0
Mozilla	Thunderbird	< 68.5.0
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	19.10

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1595786%2C1596706%2C1598543%2C1604851%2C1608580%2C1608785%2C1605777Broken Link, Issue Tracking
https://security.gentoo.org/glsa/202003-02Third Party Advisory
https://security.gentoo.org/glsa/202003-10Third Party Advisory
https://usn.ubuntu.com/4278-2/Third Party Advisory
https://usn.ubuntu.com/4328-1/Third Party Advisory
https://usn.ubuntu.com/4335-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-05/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-06/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-07/Vendor Advisory
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1595786%2C1596706%2C1598543%2C1604851%2C1608580%2C1608785%2C1605777Broken Link, Issue Tracking
https://security.gentoo.org/glsa/202003-02Third Party Advisory
https://security.gentoo.org/glsa/202003-10Third Party Advisory
https://usn.ubuntu.com/4278-2/Third Party Advisory
https://usn.ubuntu.com/4328-1/Third Party Advisory
https://usn.ubuntu.com/4335-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2020-05/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-06/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-07/Vendor Advisory

Timeline

Published: Mar 2, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-6800?

How severe is CVE-2020-6800?

CVE-2020-6800 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.27% probability of exploitation in the next 30 days.

How do I fix CVE-2020-6800?

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-2020-6800?

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

Scan your code now

Source: NVD / NIST