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Vulnerability details: VCID-8rcs-v81q-wyhd
Vulnerability ID VCID-8rcs-v81q-wyhd
Aliases CVE-2019-9721
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 5.9
Risk 3.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-400 Uncontrolled Resource Consumption
CWE-125 Out-of-bounds Read
System Score Found at
cvssv3 4.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-9721.json
epss 0.00462 https://api.first.org/data/v1/epss?cve=CVE-2019-9721
epss 0.00462 https://api.first.org/data/v1/epss?cve=CVE-2019-9721
epss 0.00462 https://api.first.org/data/v1/epss?cve=CVE-2019-9721
epss 0.00462 https://api.first.org/data/v1/epss?cve=CVE-2019-9721
epss 0.00462 https://api.first.org/data/v1/epss?cve=CVE-2019-9721
epss 0.00462 https://api.first.org/data/v1/epss?cve=CVE-2019-9721
epss 0.00462 https://api.first.org/data/v1/epss?cve=CVE-2019-9721
epss 0.00462 https://api.first.org/data/v1/epss?cve=CVE-2019-9721
epss 0.00462 https://api.first.org/data/v1/epss?cve=CVE-2019-9721
epss 0.00462 https://api.first.org/data/v1/epss?cve=CVE-2019-9721
epss 0.00462 https://api.first.org/data/v1/epss?cve=CVE-2019-9721
epss 0.00462 https://api.first.org/data/v1/epss?cve=CVE-2019-9721
epss 0.00462 https://api.first.org/data/v1/epss?cve=CVE-2019-9721
epss 0.00462 https://api.first.org/data/v1/epss?cve=CVE-2019-9721
epss 0.00462 https://api.first.org/data/v1/epss?cve=CVE-2019-9721
epss 0.00462 https://api.first.org/data/v1/epss?cve=CVE-2019-9721
epss 0.00462 https://api.first.org/data/v1/epss?cve=CVE-2019-9721
cvssv3 4.3 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2019-9721
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2019-9721
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-9721.json
https://api.first.org/data/v1/epss?cve=CVE-2019-9721
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9721
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/894995c41e0795c7a44f81adc4838dedc3932e65
https://github.com/FFmpeg/FFmpeg/commit/273f2755ce8635d42da3cde0eeba15b2e7842774
http://www.securityfocus.com/bid/107384
1708107 https://bugzilla.redhat.com/show_bug.cgi?id=1708107
926666 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=926666
cpe:2.3:a:ffmpeg:ffmpeg:3.2:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:ffmpeg:ffmpeg:3.2:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:4.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:ffmpeg:ffmpeg:4.1:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*
CVE-2019-9721 https://nvd.nist.gov/vuln/detail/CVE-2019-9721
USN-3967-1 https://usn.ubuntu.com/3967-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-9721.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2019-9721
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2019-9721
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.63233
EPSS Score 0.00462
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:29:21.770268+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.9/community.json 37.0.0