Description
The IonMonkey just-in-time (JIT) compiler can leak an internal JS_OPTIMIZED_OUT magic value to the running script during a bailout. This magic value can then be used by JavaScript to achieve memory corruption, which results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.
Published: 2019-04-26
Score: 9.8 Critical
EPSS: 19.0% Moderate
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-1722-1 firefox-esr security update
Debian DLA Debian DLA DLA-1743-1 thunderbird security update
Debian DSA Debian DSA DSA-4411-1 firefox-esr security update
Debian DSA Debian DSA DSA-4420-1 thunderbird security update
Ubuntu USN Ubuntu USN USN-3918-1 Firefox vulnerabilities
Ubuntu USN Ubuntu USN USN-3918-2 Firefox vulnerabilities
Ubuntu USN Ubuntu USN USN-3927-1 Thunderbird vulnerabilities
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

Subscriptions

Mozilla Firefox Thunderbird
Redhat Enterprise Linux Enterprise Linux Eus Enterprise Linux Server Aus Enterprise Linux Server Tus
cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2024-08-04T22:01:54.735Z

Reserved: 2019-03-14T00:00:00.000Z

Link: CVE-2019-9792

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2019-04-26T17:29:01.697

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

Link: CVE-2019-9792

cve-icon Redhat

Severity : Critical

Publid Date: 2019-03-20T00:00:00Z

Links: CVE-2019-9792 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses