Incorrect handling of __proto__ mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read and write. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1.
Advisories
Source ID Title
Debian DLA Debian DLA DLA-1727-1 firefox-esr security update
Debian DSA Debian DSA DSA-4417-1 firefox-esr security update
Ubuntu USN Ubuntu USN USN-3919-1 Firefox vulnerabilities
Ubuntu USN Ubuntu USN USN-3927-1 Thunderbird vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Tue, 25 Nov 2025 18:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
Vendors & Products Mozilla firefox Esr

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2024-08-04T22:01:54.683Z

Reserved: 2019-03-14T00:00:00

Link: CVE-2019-9813

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2019-04-26T17:29:04.163

Modified: 2025-11-25T17:50:16.803

Link: CVE-2019-9813

cve-icon Redhat

Severity : Critical

Publid Date: 2019-03-22T00:00:00Z

Links: CVE-2019-9813 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses