CVE-2019-9792

9.8 CRITICAL
Published: April 26, 2019 Modified: November 25, 2025
View on NVD

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

Login to generate AI explanation

CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
http://packetstormsecurity.com/files/153106/Spidermonkey-IonMonkey-JS_OPTIMIZED_OUT-Value-Leak.html
Source: security@mozilla.org
Exploit Third Party Advisory VDB Entry
https://access.redhat.com/errata/RHSA-2019:0966
Source: security@mozilla.org
Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1144
Source: security@mozilla.org
Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1532599
Source: security@mozilla.org
Exploit Issue Tracking Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-07/
Source: security@mozilla.org
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-08/
Source: security@mozilla.org
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-11/
Source: security@mozilla.org
Vendor Advisory
http://packetstormsecurity.com/files/153106/Spidermonkey-IonMonkey-JS_OPTIMIZED_OUT-Value-Leak.html
Source: af854a3a-2127-422b-91ae-364da2661108
Exploit Third Party Advisory VDB Entry
https://access.redhat.com/errata/RHSA-2019:0966
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1144
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1532599
Source: af854a3a-2127-422b-91ae-364da2661108
Exploit Issue Tracking Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-07/
Source: af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-08/
Source: af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-11/
Source: af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory

14 reference(s) from NVD

Quick Stats

CVSS v3 Score
9.8 / 10.0
EPSS (Exploit Probability)
19.7%
95th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

CWE-787

Affected Vendors

mozilla redhat

Related CVEs

CVE-2025-52691 10.0
CVE-2025-15168 7.3
CVE-2025-15167 7.3
CVE-2025-15166 7.3
CVE-2025-15165 7.3