CVE-2019-11758

Name: CVE-2019-11758
Creator: NVD / NIST
Published: 2020-01-08T20:15:12.547+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.33%

Last modified Jun 17, 2026

CVE-2019-11758 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Mozilla community member Philipp reported a memory safety bug present in Firefox 68 when 360 Total Security was installed. This bug showed evidence of memory corruption in the accessibility engine and we presume that with enough effort that it could be exploited to run arbitrary code. EPSS estimates a 1.33% chance of exploitation in the next 30 days.

Description

Mozilla community member Philipp reported a memory safety bug present in Firefox 68 when 360 Total Security was installed. This bug showed evidence of memory corruption in the accessibility engine and we presume that with enough effort that it could be exploited to run arbitrary code. This vulnerability affects Firefox < 69, Thunderbird < 68.2, and Firefox ESR < 68.2.

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

1.33%

67.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 69.0
Mozilla	Firefox Esr	< 68.2
Mozilla	Thunderbird	< 68.2
Canonical	Ubuntu Linux	16.04

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1536227Exploit, Issue Tracking, Vendor Advisory
https://usn.ubuntu.com/4335-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-25/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-33/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-35/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1536227Exploit, Issue Tracking, Vendor Advisory
https://usn.ubuntu.com/4335-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-25/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-33/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-35/Vendor Advisory

Timeline

Published: Jan 8, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-11758?

How severe is CVE-2019-11758?

CVE-2019-11758 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.33% probability of exploitation in the next 30 days.

How do I fix CVE-2019-11758?

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-2019-11758?

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

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Source: NVD / NIST