CVE-2021-4217

Name	CVE-2021-4217
Description	A flaw was found in unzip. The vulnerability occurs due to improper handling of Unicode strings, which can lead to a null pointer dereference. This flaw allows an attacker to input a specially crafted zip file, leading to a crash or code execution.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
unzip (PTS)	buster	6.0-23+deb10u2	vulnerable
	buster (security)	6.0-23+deb10u3	vulnerable
	bullseye (security), bullseye	6.0-26+deb11u1	vulnerable
	bookworm, sid	6.0-28	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
unzip	source	(unstable)	(unfixed)	unimportant

Notes

https://bugzilla.redhat.com/show_bug.cgi?id=2044583
https://bugs.launchpad.net/ubuntu/+source/unzip/+bug/1957077
Crash in CLI tool, no security impact