CVE-2021-23960

high

Description

Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1675755

https://www.mozilla.org/security/advisories/mfsa2021-03/

https://www.mozilla.org/security/advisories/mfsa2021-04/

https://www.mozilla.org/security/advisories/mfsa2021-05/

Details

Source: MITRE

Published: 2021-02-26

Updated: 2021-03-03

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: 8.8

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

Impact Score: 5.9

Exploitability Score: 2.8

Severity: HIGH