CVE-2021-4217

Name: CVE-2021-4217
Creator: NVD / NIST
Published: 2022-08-24T16:15:10.09+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.3/10EPSS 0.57%

Last modified Jun 17, 2026

CVE-2021-4217 is a low-severity vulnerability rated 3.3/10 on the CVSS scale. A flaw was found in unzip. The vulnerability occurs due to improper handling of Unicode strings, which can lead to a null pointer dereference. EPSS estimates a 0.57% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

3.3/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

EPSS Probability

0.57%

42.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Unzip Project	Unzip	6.0
Fedoraproject	Fedora	35
Redhat	Enterprise Linux	6.0
Redhat	Enterprise Linux	7.0
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux	9.0

References

https://access.redhat.com/security/cve/CVE-2021-4217Third Party Advisory
https://bugs.launchpad.net/ubuntu/+source/unzip/+bug/1957077Exploit, Issue Tracking, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2044583Exploit, Issue Tracking, Third Party Advisory
https://access.redhat.com/security/cve/CVE-2021-4217Third Party Advisory
https://bugs.launchpad.net/ubuntu/+source/unzip/+bug/1957077Exploit, Issue Tracking, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2044583Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Aug 24, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4217?

How severe is CVE-2021-4217?

CVE-2021-4217 has a CVSS score of 3.3/10 (LOW severity). The EPSS model estimates a 0.57% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4217?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-4217?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST