CVE-2019-9721: Medium severity FFmpeg FFmpeg vulnerability
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 handleopenbrace in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/ffmpegto a version that resolves this vulnerability.Fixed in 7:4.3.7-0+deb11u1Fixed in 7:4.3.9-0+deb11u2Fixed in 7:5.1.8-0+deb12u1Fixed in 7:7.1.3-0+deb13u1Fixed in 7:8.0.1-3Fixed in 7:8.1-3 - Upgrade
Upgrade
alpine/ffmpegto a version that resolves this vulnerability.Fixed in 4.1.3-r0 - Upgrade
Upgrade
alpine/ffmpegto a version that resolves this vulnerability.Fixed in 3.4.6-r0 - Upgrade
Upgrade
alpine/ffmpegto a version that resolves this vulnerability.Fixed in 4.0.4-r0 - Upgrade
Upgrade
alpine/ffmpeg4to a version that resolves this vulnerability.Fixed in 4.1.3-r0
Event History
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