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

Risk Information

CVSS v2

CVSS v3