CVE-2018-21015 Null dereference in n/a

What is CVE-2018-21015?

CVE-2018-21015 is a medium-severity vulnerability in Debian Debian Linux, published on 16 Sep 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

AVC_DuplicateConfig() at isomedia/avc_ext.c in GPAC 0.7.1 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted file. There is "cfg_new->AVCLevelIndication = cfg->AVCLevelIndication;" but cfg could be NULL.

Weakness: CWE-476

Which versions are affected by CVE-2018-21015?

It affects 2 products.

Products include Debian Debian Linux, Gpac Gpac.

How do I fix CVE-2018-21015?

Upgrade to a fixed version.

Is CVE-2018-21015 being exploited?

There is no known exploitation of CVE-2018-21015 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-2018-21015, GHSA-2675-7qgw-hjvx, UBUNTU-CVE-2018-21015.