CVE-2021-42376

Name	CVE-2021-42376
Description	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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
Debian Bugs	999567

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
busybox (PTS)	stretch	1:1.22.0-19	fixed
	stretch (security)	1:1.22.0-19+deb9u2	fixed
	buster	1:1.30.1-4	vulnerable
	bullseye	1:1.30.1-6	vulnerable
	bookworm, sid	1:1.30.1-7	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
busybox	source	stretch	(not affected)
busybox	source	(unstable)	(unfixed)	unimportant		999567

Notes

[stretch] - busybox <not-affected> (CONFIG_HUSH is not set)
https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/
Crash in CLI tool, no security impact