Vulnerability Details : CVE-2019-9721
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.
Vulnerability category: Denial of service
Products affected by CVE-2019-9721
- cpe:2.3:a:ffmpeg:ffmpeg:3.2:*:*:*:*:*:*:*
- cpe:2.3:a:ffmpeg:ffmpeg:4.1:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2019-9721
0.46%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 61 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2019-9721
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:N/A:P |
8.6
|
2.9
|
NIST | |
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
2.8
|
3.6
|
NIST |
CWE ids for CVE-2019-9721
-
The product reads data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2019-9721
-
https://usn.ubuntu.com/3967-1/
USN-3967-1: FFmpeg vulnerabilities | Ubuntu security noticesThird Party Advisory
-
http://www.securityfocus.com/bid/107384
FFmpeg CVE-2019-9721 Denial of Service VulnerabilityBroken Link
-
https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/894995c41e0795c7a44f81adc4838dedc3932e65
git.ffmpeg.org Git - ffmpeg.git/commitMailing List;Patch;Third Party Advisory
-
https://github.com/FFmpeg/FFmpeg/commit/273f2755ce8635d42da3cde0eeba15b2e7842774
avcodec/htmlsubtitles: Fixes denial of service due to use of sscanf i… · FFmpeg/FFmpeg@273f275 · GitHubPatch;Third Party Advisory
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