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
| Affected Software | Affected Version | How 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 7:5.1.6-0+deb12u1 7:7.0.2-3 |
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Reference Links
- http://www.securityfocus.com/bid/107384
- https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/894995c41e0795c7a44f81adc4838dedc3932e65
- https://usn.ubuntu.com/3967-1/
- https://github.com/FFmpeg/FFmpeg/commit/273f2755ce8635d42da3cde0eeba15b2e7842774
- https://launchpad.net/bugs/cve/CVE-2019-9721
- https://security-tracker.debian.org/tracker/CVE-2019-9721
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9721
- https://nvd.nist.gov/vuln/detail/CVE-2019-9721
- https://ubuntu.com/security/CVE-2019-9721
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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