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Vulnerability details: VCID-cqak-9v99-q3ed
Vulnerability ID VCID-cqak-9v99-q3ed
Aliases CVE-2021-30123
Summary FFmpeg <=4.3 contains a buffer overflow vulnerability in libavcodec through a crafted file that may lead to remote code execution.
Status Published
Exploitability 0.5
Weighted Severity 7.9
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
System Score Found at
epss 0.03431 https://api.first.org/data/v1/epss?cve=CVE-2021-30123
epss 0.03431 https://api.first.org/data/v1/epss?cve=CVE-2021-30123
epss 0.03431 https://api.first.org/data/v1/epss?cve=CVE-2021-30123
epss 0.03431 https://api.first.org/data/v1/epss?cve=CVE-2021-30123
epss 0.03431 https://api.first.org/data/v1/epss?cve=CVE-2021-30123
epss 0.03431 https://api.first.org/data/v1/epss?cve=CVE-2021-30123
epss 0.03431 https://api.first.org/data/v1/epss?cve=CVE-2021-30123
epss 0.03431 https://api.first.org/data/v1/epss?cve=CVE-2021-30123
epss 0.03431 https://api.first.org/data/v1/epss?cve=CVE-2021-30123
epss 0.03431 https://api.first.org/data/v1/epss?cve=CVE-2021-30123
epss 0.03431 https://api.first.org/data/v1/epss?cve=CVE-2021-30123
epss 0.03431 https://api.first.org/data/v1/epss?cve=CVE-2021-30123
epss 0.03431 https://api.first.org/data/v1/epss?cve=CVE-2021-30123
epss 0.03431 https://api.first.org/data/v1/epss?cve=CVE-2021-30123
epss 0.03431 https://api.first.org/data/v1/epss?cve=CVE-2021-30123
cvssv3.1 5.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 6.8 https://nvd.nist.gov/vuln/detail/CVE-2021-30123
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2021-30123
archlinux Medium https://security.archlinux.org/AVG-1786
Reference id Reference type URL
http://git.videolan.org/?p=ffmpeg.git%3Ba=commitdiff%3Bh=d6f293353c94c7ce200f6e0975ae3de49787f91f
https://api.first.org/data/v1/epss?cve=CVE-2021-30123
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://security.gentoo.org/glsa/202105-24
https://trac.ffmpeg.org/ticket/8845
https://trac.ffmpeg.org/ticket/8863
AVG-1786 https://security.archlinux.org/AVG-1786
cpe:2.3:a:ffmpeg:ffmpeg:4.4:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:ffmpeg:ffmpeg:4.4:*:*:*:*:*:*:*
CVE-2021-30123 https://nvd.nist.gov/vuln/detail/CVE-2021-30123
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H 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:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-30123
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:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-30123
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 0.87029
EPSS Score 0.03431
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:50:00.954140+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.20/community.json 37.0.0