CVE-2021-23962: Mozilla Firefox

High severity, CVSS 8.8. EPSS: 0.9% chance of exploitation in the next 30 days.

Incorrect use of the '<RowCountChanged>' method could have led to a user-after-poison and a potentially exploitable crash. This vulnerability affects Firefox < 85.

Affected products

• Mozilla Firefox: before 85.0 (fixed in 85.0)

Published 2021-02-26. Last modified 2026-06-17.