Home/CVE/The IonMonkey just-in-time (JIT) compiler can leak an internal JS_OPTIMIZED_OUT magic value to the running script during
CVE

CVE-2019-9792

The IonMonkey just-in-time (JIT) compiler can leak an internal JS_OPTIMIZED_OUT magic value to the running script during

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.

CRITICAL · CVSS 9.8 EPSS 0.18866
Act now
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 5% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules1 YARA rules0
⬡

Weakness Classification

CWE-787Out-of-bounds Write
▤

Affected Products & Versions

7
mozilla firefox< 60.6.0
mozilla firefox< 66.0
mozilla thunderbird< 60.6.0
redhat enterprise linuxall versions
redhat enterprise linux eusall versions
redhat enterprise linux server ausall versions
redhat enterprise linux server tusall versions
⚠

Public Exploits & PoCs

3
dosSpidermonkey - IonMonkey Leaks JS_OPTIMIZED_OUT Magic Value to Scriptverified
pocpacketstormsecurity.com · Spidermonkey-IonMonkey-JS_OPTIMIZED_OUT-Value-Leak.htmlpacketstormsecurity.com
pocbugzilla.mozilla.org · show_bug.cgi?id=1532599bugzilla.mozilla.org
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSQLite Firefox Profile Data DB Access
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · security@mozilla.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD26 Apr 2019 · 05:29 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

18
suse-csafopenSUSE-SU-2024:14572-1
suse-csafopenSUSE-SU-2024:10600-1
suse-csafopenSUSE-SU-2019:1162-1
suse-csafSUSE-SU-2019:0871-1
suse-csafopenSUSE-SU-2019:1126-1
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.mozilla.org/security/advisories/mfsa2019-07/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-08/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-11/Vendor Advisory
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