CVE-2017-14121 Null dereference in n/a

What is CVE-2017-14121?

CVE-2017-14121 is a medium-severity vulnerability in Debian Debian Linux, published on 3 Sep 2017. 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

The DecodeNumber function in unrarlib.c in unrar 0.0.1 (aka unrar-free or unrar-gpl) suffers from a NULL pointer dereference flaw triggered by a crafted RAR archive. NOTE: this may be the same as one of the several test cases in the CVE-2017-11189 references.

Weakness: CWE-476

Which versions are affected by CVE-2017-14121?

It affects 2 products.

Products include Debian Debian Linux, Rarlab Unrar.

How do I fix CVE-2017-14121?

Apply the vendor's patch.

Is CVE-2017-14121 being exploited?

There is no known exploitation of CVE-2017-14121 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-2017-14121, GHSA-r9qm-gm5q-gx7p, UBUNTU-CVE-2017-14121.