CVE-2019-9792

Mozilla: IonMonkey leaks JS_OPTIMIZED_OUT magic value to script

Published Apr 26, 2019 CVSS 3.1 · 9.8 Critical EPSS 13.3% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

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

Sources

Status
PUBLISHED
Assigner
mozilla
Published
Updated
Aug 4, 2024, 10:01 PM
Reserved
Mar 14, 2019, 12:00 AM
Status
Modified
Published
Apr 26, 2019, 5:29 PM
Modified
Jun 17, 2026, 2:44 AM
Severity
Critical
Public date
Mar 20, 2019, 12:00 AM