CVSS v3
8.8
HIGH
EPSS Score
51.5%
exploit probability
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Incorrect handling of __proto__ mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read and write. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1.
Incorrect handling of __proto__ mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read and write. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1.
Active exploitation of CVE-2019-9813 has not been confirmed. The EPSS score is 51.5%, indicating the estimated probability of exploitation in the next 30 days.
CVE-2019-9813 has a CVSS v3 base score of 8.8 (HIGH severity).
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Ranked by exploit probability (EPSS).