CVE-2019-9791

critical-risk
Published 2019-04-26

The type inference system allows the compilation of functions that can cause type confusions between arbitrary objects when compiled through the IonMonkey just-in-time (JIT) compiler and when the constructor function is entered through on-stack replacement (OSR). This allows for possible arbitrary reading and writing of objects during an exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

Do I need to act?

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38.1% chance of exploitation in next 30 days
EPSS score — higher than 62% 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
46613
?
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 (12)

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=1530958
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/
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=1530958
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/
71
/ 100
critical-risk
Severity 32/34 · Critical
Exploitability 23/34 · High
Exposure 16/34 · Moderate