Race Condition in Web Worker Shutdown Code: Use-After-Free Vulnerability in Firefox and Thunderbird

Race Condition in Web Worker Shutdown Code: Use-After-Free Vulnerability in Firefox and Thunderbird

CVE-2020-12387 · HIGH Severity

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.

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