CVE-2019-11757

HighCVSS 8.8/10Last modified Jun 17, 2026

Description

When following the value's prototype chain, it was possible to retain a reference to a locale, delete it, and subsequently reference it. This resulted in a use-after-free and a potentially exploitable crash. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

Vendor	Product	Versions
Mozilla	Firefox	before 70
Mozilla	Thunderbird	before 68.2
Mozilla	Firefox ESR	before 68.2

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1577107Issue Tracking, Permissions Required
https://security.gentoo.org/glsa/202003-10Third Party Advisory
https://usn.ubuntu.com/4335-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-33/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-34/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-35/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1577107Issue Tracking, Permissions Required
https://security.gentoo.org/glsa/202003-10Third Party Advisory
https://usn.ubuntu.com/4335-1/Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-33/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-34/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-35/Vendor Advisory

Timeline

Published: Jan 8, 2020
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2019

CVE-2019-117588.8Mozilla community member Philipp reported a memory safety bug present in Firefox 68 when 360 Total Security was installed. This bug showed e CVE-2019-117598.8An attacker could have caused 4 bytes of HMAC output to be written past the end of a buffer stored on the stack. This could be used by an at CVE-2019-11767.0An elevation of privilege vulnerability exists when DirectX improperly handles objects in memory. An attacker who successfully exploited thi CVE-2019-117608.8A fixed-size stack buffer could overflow in nrappkit when doing WebRTC signaling. This resulted in a potentially exploitable crash in some i CVE-2019-117615.4By using a form with a data URI it was possible to gain access to the privileged JSONView object that had been cloned into content. Impact f CVE-2019-117626.1If two same-origin documents set document.domain differently to become cross-origin, it was possible for them to call arbitrary DOM methods/CVE-2019-117636.1Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities. This could have CVE-2019-117648.8Mozilla developers and community members reported memory safety bugs present in Firefox 69 and Firefox ESR 68.1. Some of these bugs showed e CVE-2019-117656.5A compromised content process could send a message to the parent process that would cause the 'Click to Play' permission prompt to be shown.CVE-2019-117669.8dhcp6.c in dhcpcd before 6.11.7 and 7.x before 7.2.2 has a buffer over-read in the D6_OPTION_PD_EXCLUDE feature.CVE-2019-117675.8Server side request forgery (SSRF) in phpBB before 3.2.6 allows checking for the existence of files and services on the local network of the CVE-2019-117689.8An issue was discovered in phpMyAdmin before 4.9.0.1. A vulnerability was reported where a specially crafted database name can be used to tr