CVE-2021-42376: Busybox

Medium severity, CVSS 5.5. EPSS: 0.4% chance of exploitation in the next 30 days.

A NULL pointer dereference in Busybox's hush applet leads to denial of service when processing a crafted shell command, due to missing validation after a \x03 delimiter character. This may be used for DoS under very rare conditions of filtered command input.

Affected products

• Busybox Busybox: from 1.16.0, before 1.34.0 (fixed in 1.34.0)
• Fedoraproject Fedora: version 33 only; version 34 only
• Netapp Cloud Backup: affected versions not specified
• Netapp h300e Firmware: affected versions not specified
• Netapp h300s Firmware: affected versions not specified
• Netapp h410s Firmware: affected versions not specified
• Netapp h500e Firmware: affected versions not specified
• Netapp h500s Firmware: affected versions not specified
• Netapp h700e Firmware: affected versions not specified
• Netapp h700s Firmware: affected versions not specified
• Netapp Hci Management Node: affected versions not specified
• Netapp Solidfire: affected versions not specified

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