CWE
125
Advisory Published
Updated

CVE-2019-9721

First published: Tue Mar 12 2019(Updated: )

A denial of service in the subtitle decoder in FFmpeg 3.2 and 4.1 allows attackers to hog the CPU via a crafted video file in Matroska format, because handle_open_brace in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.

Credit: cve@mitre.org cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
FFmpeg FFmpeg=3.2
FFmpeg FFmpeg=4.1
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=18.10
Canonical Ubuntu Linux=19.04
debian/ffmpeg
7:4.3.7-0+deb11u1
7:4.3.8-0+deb11u1
7:5.1.6-0+deb12u1
7:7.1-3

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Frequently Asked Questions

  • What is the vulnerability ID for this denial of service vulnerability in FFmpeg?

    The vulnerability ID is CVE-2019-9721.

  • What is the severity level of CVE-2019-9721?

    The severity level of CVE-2019-9721 is medium, with a severity value of 6.5.

  • Which software versions are affected by CVE-2019-9721?

    FFmpeg versions 3.2 and 4.1 are affected by CVE-2019-9721.

  • How can an attacker exploit CVE-2019-9721?

    An attacker can exploit CVE-2019-9721 by using a crafted video file in Matroska format to hog the CPU through the subtitle decoder in FFmpeg.

  • Are there any references available for CVE-2019-9721?

    Yes, you can find references for CVE-2019-9721 at the following links: - http://www.securityfocus.com/bid/107384 - https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/894995c41e0795c7a44f81adc4838dedc3932e65 - https://github.com/FFmpeg/FFmpeg/commit/273f2755ce8635d42da3cde0eeba15b2e7842774

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