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.
Published 2019-03-12 09:29:01
Updated 2022-10-07 01:58:00
Source MITRE
View at NVD,   CVE.org
Vulnerability category: Denial of service

Exploit prediction scoring system (EPSS) score for CVE-2019-9721

0.21%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 59 %
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

Products affected by CVE-2019-9721

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