CVE-2021-4166: Apple Mac OS X

High severity, CVSS 7.1. EPSS: 1.6% chance of exploitation in the next 30 days.

vim is vulnerable to Out-of-bounds Read

Affected products

• Apple Mac OS X: version 10.15.7 only
• Apple macOS: before 12.3 (fixed in 12.3); from 11.0, before 11.6.6 (fixed in 11.6.6); version 10.15.7 only
• Debian Debian Linux: version 9.0 only; version 10.0 only; version 11.0 only
• Fedoraproject Fedora: version 34 only; version 35 only
• Opensuse Factory: affected versions not specified
• Red Hat Enterprise Linux: version 8.0 only
• Suse Linux Enterprise: version 12.0 only; version 15.0 only
• Vim Vim: before 8.2.3884 (fixed in 8.2.3884)

Published 2021-12-25. Last modified 2026-10-08.