CVE-2021-27345 Null dereference in n/a

What is CVE-2021-27345?

CVE-2021-27345 is a medium-severity vulnerability in Debian Debian Linux, published on 10 Jun 2021. 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 null pointer dereference was discovered in ucompthread in stream.c in Irzip 0.631 which allows attackers to cause a denial of service (DOS) via a crafted compressed file.

Weakness: CWE-476

Which versions are affected by CVE-2021-27345?

It affects 2 products.

Products include Debian Debian Linux, Long Range Zip Project Long Range Zip.

How do I fix CVE-2021-27345?

Upgrade to a fixed version.

Is CVE-2021-27345 being exploited?

There is no known exploitation of CVE-2021-27345 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2021-27345, GHSA-7h9p-4h36-3h37, UBUNTU-CVE-2021-27345.