CVE-2019-17539 Null dereference in n/a

What is CVE-2019-17539?

CVE-2019-17539 is a critical vulnerability in Canonical Ubuntu Linux, published on 14 Oct 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In FFmpeg before 4.2, avcodec_open2 in libavcodec/utils.c allows a NULL pointer dereference and possibly unspecified other impact when there is no valid close function pointer.

Weakness: CWE-476

Which versions are affected by CVE-2019-17539?

It affects 3 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Ffmpeg Ffmpeg.

How do I fix CVE-2019-17539?

Upgrade to a fixed version.

Is CVE-2019-17539 being exploited?

There is no known exploitation of CVE-2019-17539 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

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

Also known as CLEANSTART-2024-KA35292, DEBIAN-CVE-2019-17539, GHSA-wmwf-43vq-qhq2, JLSEC-2025-106, UBUNTU-CVE-2019-17539.