CVE-2019-9792

high-risk
Published 2019-04-26

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.

Do I need to act?

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18.9% chance of exploitation in next 30 days
EPSS score — higher than 81% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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1 public exploit available
46939
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (10)

Affected Vendors

Redhat Mozilla

References (14)

Exploit http://packetstormsecurity.com/files/153106/Spidermonkey-IonMonkey-JS_OPTIMIZED_...
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:0966
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:1144
Exploit https://bugzilla.mozilla.org/show_bug.cgi?id=1532599
Vendor Advisory 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/
Exploit http://packetstormsecurity.com/files/153106/Spidermonkey-IonMonkey-JS_OPTIMIZED_...
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:0966
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:1144
Exploit https://bugzilla.mozilla.org/show_bug.cgi?id=1532599
Vendor Advisory 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/
68
/ 100
high-risk
Severity 32/34 · Critical
Exploitability 20/34 · Moderate
Exposure 16/34 · Moderate