CVE-2021-4217 Null dereference in unzip

What is CVE-2021-4217?

CVE-2021-4217 is a low-severity vulnerability in Fedoraproject Fedora, published on 24 Aug 2022. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-476

Which versions are affected by CVE-2021-4217?

It affects 3 products.

Products include Fedoraproject Fedora, Redhat Enterprise Linux, Unzip Project Unzip.

How do I fix CVE-2021-4217?

Apply the vendor's patch.

Is CVE-2021-4217 being exploited?

There is no known exploitation of CVE-2021-4217 in the wild and no public exploit code.

Other vulnerabilities in Fedoraproject Fedora

• CVE-2024-4577 PHP-CGI OS Command Injection Exploited Critical 9.8
• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2021-4217, AZL-10680, AZL-35342, DEBIAN-CVE-2021-4217, ECHO-d2dd-c0a4-1d52, GHSA-9xxw-h585-3vfj and 4 more.