Race Condition Use-After-Free Vulnerability in Thunderbird and Firefox

Race Condition Use-After-Free Vulnerability in Thunderbird and Firefox

CVE-2020-6820 · HIGH Severity

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

Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.

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