CVE-2019-11707

Name: CVE-2019-11707
Creator: NVD / NIST
Published: 2019-07-23T14:15:15.233+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10Actively ExploitedEPSS 37.95%

Last modified Jun 17, 2026

CVE-2019-11707 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. A type confusion vulnerability can occur when manipulating JavaScript objects due to issues in Array.pop. This can allow for an exploitable crash. CISA has confirmed active exploitation in the wild. EPSS estimates a 37.95% chance of exploitation in the next 30 days.

Description

A type confusion vulnerability can occur when manipulating JavaScript objects due to issues in Array.pop. This can allow for an exploitable crash. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 60.7.1, Firefox < 67.0.3, and Thunderbird < 60.7.2.

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

37.95%

98.4th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Jun 13, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 60.7.1
Mozilla	Firefox	< 67.0.3
Mozilla	Thunderbird	< 60.7.2

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1544386Issue Tracking, Permissions Required, Vendor Advisory
https://security.gentoo.org/glsa/201908-12Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-18/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-20/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1544386Issue Tracking, Permissions Required, Vendor Advisory
https://security.gentoo.org/glsa/201908-12Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-18/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-20/Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-11707US Government Resource

Timeline

Published: Jul 23, 2019
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2019-11707?

How severe is CVE-2019-11707?

CVE-2019-11707 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 37.95% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2019-11707?

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-2019-11707?

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

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Source: NVD / NIST