CVE-2019-9813

—

CVSS 3.0

8.8 high

EPSS

7%p94

Published

Apr 26, 2019 (Apr 26, 2019)

Modified

Jun 17, 2026

Description

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.

Vendors: mozilla
Products: firefox, thunderbird
Weakness: CWE-843
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (7.4%)

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