What’s Vulnerable › Vulnerabilities

CVE-2019-11740

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-09-27 · updated 2026-06-17
• Weakness: CWE-787

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.

Affected products

• Canonical Ubuntu Linux: 16.04, 18.04, 19.04
• Mozilla Firefox: before 60.9.0; before 69.0 — fixed in 60.9.0, 69.0
• Mozilla Firefox ESR: from 68.0 before 68.1.0 — fixed in 68.1.0
• Mozilla Thunderbird: before 60.9.0; from 68.0 before 68.1.0 — fixed in 60.9.0, 68.1.0
• openSUSE Leap: 15.0, 15.1

How to fix

Upgrade to a fixed version: Mozilla Firefox 60.9.0, 69.0; Mozilla Firefox ESR 68.1.0; Mozilla Thunderbird 60.9.0, 68.1.0. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
• http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1563133%2C1573160
• https://security.gentoo.org/glsa/201911-07
• https://usn.ubuntu.com/4150-1/
• https://www.mozilla.org/security/advisories/mfsa2019-25/
• https://www.mozilla.org/security/advisories/mfsa2019-26/
• https://www.mozilla.org/security/advisories/mfsa2019-27/
• https://www.mozilla.org/security/advisories/mfsa2019-29/
• https://www.mozilla.org/security/advisories/mfsa2019-30/

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