CVE-2019-11740

Name: CVE-2019-11740
Creator: NVD / NIST
Published: 2019-09-27T18:15:11.77+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.64%

Last modified Jun 17, 2026

CVE-2019-11740 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 68, Firefox ESR 68, and Firefox 60.8. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. EPSS estimates a 1.64% chance of exploitation in the next 30 days.

Description

Mozilla developers and community members reported memory safety bugs present in Firefox 68, Firefox ESR 68, and Firefox 60.8. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 69, Thunderbird < 68.1, Thunderbird < 60.9, Firefox ESR < 60.9, and Firefox ESR < 68.1.

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

1.64%

73.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 60.9.0
Mozilla	Firefox	< 69.0
Mozilla	Firefox Esr	>= 68.0, < 68.1.0
Mozilla	Thunderbird	< 60.9.0
Mozilla	Thunderbird	>= 68.0, < 68.1.0
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	19.04
Opensuse	Leap	15.0
Opensuse	Leap	15.1

References

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.htmlMailing List, Third Party Advisory
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1563133%2C1573160Issue Tracking, Not Applicable, Vendor Advisory
https://security.gentoo.org/glsa/201911-07Third Party Advisory
https://usn.ubuntu.com/4150-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-25/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-26/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-27/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-29/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-30/Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.htmlMailing List, Third Party Advisory
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1563133%2C1573160Issue Tracking, Not Applicable, Vendor Advisory
https://security.gentoo.org/glsa/201911-07Third Party Advisory
https://usn.ubuntu.com/4150-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-25/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-26/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-27/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-29/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-30/Vendor Advisory

Timeline

Published: Sep 27, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-11740?

How severe is CVE-2019-11740?

CVE-2019-11740 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.64% probability of exploitation in the next 30 days.

How do I fix CVE-2019-11740?

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-2019-11740?

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

Scan your code now

Source: NVD / NIST