CVE-2019-9721
FFmpeg HTML Subtitle Decoder Denial of Service
Description
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.
INFO
Published Date :
March 12, 2019, 9:29 a.m.
Last Modified :
Oct. 7, 2022, 1:57 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
2.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2019-9721.
| URL | Resource |
|---|---|
| http://www.securityfocus.com/bid/107384 | Broken Link |
| https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/894995c41e0795c7a44f81adc4838dedc3932e65 | Mailing List Patch Third Party Advisory |
| https://github.com/FFmpeg/FFmpeg/commit/273f2755ce8635d42da3cde0eeba15b2e7842774 | Patch Third Party Advisory |
| https://usn.ubuntu.com/3967-1/ | Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2019-9721 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2019-9721 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Modified Analysis by [email protected]
Oct. 07, 2022
Action Type Old Value New Value Removed CVSS V3 NIST AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Changed Reference Type http://www.securityfocus.com/bid/107384 Third Party Advisory, VDB Entry http://www.securityfocus.com/bid/107384 Broken Link Changed Reference Type https://github.com/FFmpeg/FFmpeg/commit/273f2755ce8635d42da3cde0eeba15b2e7842774 No Types Assigned https://github.com/FFmpeg/FFmpeg/commit/273f2755ce8635d42da3cde0eeba15b2e7842774 Patch, Third Party Advisory Changed Reference Type https://usn.ubuntu.com/3967-1/ No Types Assigned https://usn.ubuntu.com/3967-1/ Third Party Advisory Changed CPE Configuration OR *cpe:2.3:a:ffmpeg:ffmpeg:4.1:*:*:*:*:*:*:* OR *cpe:2.3:a:ffmpeg:ffmpeg:3.2:*:*:*:*:*:*:* *cpe:2.3:a:ffmpeg:ffmpeg:4.1:*:*:*:*:*:*:* Added CPE Configuration OR *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:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Jan. 04, 2021
Action Type Old Value New Value Changed Description A denial of service in the subtitle decoder in FFmpeg 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. 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. Added Reference https://github.com/FFmpeg/FFmpeg/commit/273f2755ce8635d42da3cde0eeba15b2e7842774 [No Types Assigned] -
CVE Modified by [email protected]
May. 06, 2019
Action Type Old Value New Value Added Reference https://usn.ubuntu.com/3967-1/ [No Types Assigned] -
Modified Analysis by [email protected]
Mar. 14, 2019
Action Type Old Value New Value Changed Reference Type http://www.securityfocus.com/bid/107384 No Types Assigned http://www.securityfocus.com/bid/107384 Third Party Advisory, VDB Entry -
CVE Modified by [email protected]
Mar. 14, 2019
Action Type Old Value New Value Added Reference http://www.securityfocus.com/bid/107384 [No Types Assigned] -
Initial Analysis by [email protected]
Mar. 12, 2019
Action Type Old Value New Value Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism Added CVSS V2 (AV:N/AC:M/Au:N/C:N/I:N/A:P) Added CVSS V3 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Changed Reference Type https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/894995c41e0795c7a44f81adc4838dedc3932e65 No Types Assigned https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/894995c41e0795c7a44f81adc4838dedc3932e65 Mailing List, Patch, Third Party Advisory Added CWE CWE-125 Added CPE Configuration OR *cpe:2.3:a:ffmpeg:ffmpeg:4.1:*:*:*:*:*:*:*
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2019-9721 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2019-9721
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.25 }} 0.04%
score
0.65356
percentile