CVE & CISA-KEV Catalog

CVE-2019-9721

MEDIUM
6.5
CVSS v3
NVD

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.

CWE-125Out-of-bounds Read

How to fix

Remediation Available
ffmpegDebian
Fixed in:7:4.1.3-1CVE-2019-9721
Fixed in:7:4.1.3-1CVE-2019-9721
Fixed in:7:4.1.3-1CVE-2019-9721
Fixed in:7:4.1.3-1CVE-2019-9721
ffmpegUbuntu
Fixed in:7:3.4.6-0ubuntu0.18.04.1USN-3967-1
libavcodec-extra57Ubuntu
Fixed in:7:3.4.6-0ubuntu0.18.04.1USN-3967-1
libavcodec57Ubuntu
Fixed in:7:3.4.6-0ubuntu0.18.04.1USN-3967-1
libavdevice57Ubuntu
Fixed in:7:3.4.6-0ubuntu0.18.04.1USN-3967-1
libavfilter-extra6Ubuntu
Fixed in:7:3.4.6-0ubuntu0.18.04.1USN-3967-1
libavfilter6Ubuntu
Fixed in:7:3.4.6-0ubuntu0.18.04.1USN-3967-1
libavformat57Ubuntu
Fixed in:7:3.4.6-0ubuntu0.18.04.1USN-3967-1
libavresample3Ubuntu
Fixed in:7:3.4.6-0ubuntu0.18.04.1USN-3967-1
libavutil55Ubuntu
Fixed in:7:3.4.6-0ubuntu0.18.04.1USN-3967-1
libpostproc54Ubuntu
Fixed in:7:3.4.6-0ubuntu0.18.04.1USN-3967-1
libswresample2Ubuntu
Fixed in:7:3.4.6-0ubuntu0.18.04.1USN-3967-1
libswscale4Ubuntu
Fixed in:7:3.4.6-0ubuntu0.18.04.1USN-3967-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Exploit Intelligence

1.42%probability of exploitation in 30 days
70thpercentile

Moderate risk: more likely to be exploited than 70% of all known CVEs.

References

Third-Party Advisory1
Other references1

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2014-0160High7.5100%KEVFix
CVE-2025-5777High7.5100%KEV + RansomFix
CVE-2021-4034High7.895%KEVFix
CVE-2023-21769High7.592%-Fix
CVE-2023-49285High8.689%-Fix
CVE-2020-8794Critical9.889%-Fix
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CVE-2019-9721 severity badge

Markdown

[![CVE-2019-9721](https://tridentstack.com/cve/badge/CVE-2019-9721.svg)](https://tridentstack.com/cve/CVE-2019-9721)

HTML

<a href="https://tridentstack.com/cve/CVE-2019-9721"><img src="https://tridentstack.com/cve/badge/CVE-2019-9721.svg" alt="CVE-2019-9721"></a>

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.