CVE-2020-6820

high

Description

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.

References

https://www.mozilla.org/security/advisories/mfsa2020-14/

https://www.mozilla.org/security/advisories/mfsa2020-11/

https://bugzilla.mozilla.org/show_bug.cgi?id=1626728

https://usn.ubuntu.com/4335-1/

Details

Source: MITRE

Published: 2020-04-24

Updated: 2021-07-21

Type: CWE-415

Risk Information

CVSS v2

Base Score: 6.8

Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P

Impact Score: 6.4

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3

Base Score: 8.1

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

Impact Score: 5.9

Exploitability Score: 2.2

Severity: HIGH