CVE-2020-26974

high

Description

When flex-basis was used on a table wrapper, a StyleGenericFlexBasis object could have been incorrectly cast to the wrong type. This resulted in a heap user-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1681022

https://www.mozilla.org/security/advisories/mfsa2020-54/

https://www.mozilla.org/security/advisories/mfsa2020-55/

https://www.mozilla.org/security/advisories/mfsa2020-56/

Details

Source: MITRE

Published: 2021-01-07

Updated: 2021-01-12

Type: CWE-787

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