CVE-2021-42378: Busybox

High severity, CVSS 7.2. EPSS: 2.7% chance of exploitation in the next 30 days.

A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the getvar_i function

Affected products

• Busybox Busybox: from 1.16.0, up to and including 1.33.1
• Fedoraproject Fedora: version 33 only; version 34 only

Published 2021-11-15. Last modified 2026-06-17.