CVE-2021-30123
FFmpeg <=4.3 contains a buffer overflow vulnerability in libavcodec through a crafted file that...
FFmpeg <=4.3 contains a buffer overflow vulnerability in libavcodec through a crafted file that may lead to remote code execution.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
FFmpeg <=4.3 contains a buffer overflow vulnerability in libavcodec through a crafted file that may lead to remote code execution.
- Record
CVE-2021-30123- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-120
- Updated
- 2026-11-02
CVE List No score
FFmpeg <=4.3 contains a buffer overflow vulnerability in libavcodec through a crafted file that may lead to remote code execution.
- Record
CVE-2021-30123- Updated
- 2026-11-02
EUVDEUVD-2021-17063 No score
FFmpeg <=4.3 contains a buffer overflow vulnerability in libavcodec through a crafted file that may lead to remote code execution.
- Record
EUVD-2021-17063- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-gx3h-4rx7-q328 No score
FFmpeg <=4.3 contains a buffer overflow vulnerability in libavcodec through a crafted file that...
FFmpeg <=4.3 contains a buffer overflow vulnerability in libavcodec through a crafted file that may lead to remote code execution.
- Record
GHSA-gx3h-4rx7-q328- Weakness
- CWE-120
- Updated
- 2026-11-02
OSVALPINE-CVE-2021-30123
FFmpeg <=4.3 contains a buffer overflow vulnerability in libavcodec through a crafted file that may lead to remote code execution.
- Record
ALPINE-CVE-2021-30123- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
OSV
FFmpeg <=4.3 contains a buffer overflow vulnerability in libavcodec through a crafted file that may lead to remote code execution.
- Record
CVE-2021-30123- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-07
OSVJLSEC-2025-112
FFmpeg <=4.3 contains a buffer overflow vulnerability in libavcodec through a crafted file that may...
FFmpeg <=4.3 contains a buffer overflow vulnerability in libavcodec through a crafted file that may lead to remote code execution.
- Record
JLSEC-2025-112- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
ffmpegAlpine:v3.14 |
before 4.4-r0 | 4.4-r0 |
ffmpegAlpine:v3.15 |
before 4.4-r0 | 4.4-r0 |
ffmpegAlpine:v3.16 |
before 4.4-r0 | 4.4-r0 |
ffmpegAlpine:v3.17 |
before 4.4-r0 | 4.4-r0 |
ffmpegAlpine:v3.18 |
before 4.4-r0 | 4.4-r0 |
ffmpegAlpine:v3.19 |
before 4.4-r0 | 4.4-r0 |
ffmpegAlpine:v3.20 |
before 4.4-r0 | 4.4-r0 |
ffmpegAlpine:v3.21 |
before 4.4-r0 | 4.4-r0 |
ffmpegAlpine:v3.22 |
before 4.4-r0 | 4.4-r0 |
ffmpegAlpine:v3.23 |
before 4.4-r0 | 4.4-r0 |
Show 9 moreShow less
| Package | Affected | Fixed |
|---|---|---|
ffmpegAlpine:v3.24 |
before 4.4-r0 | 4.4-r0 |
ffmpeg4Alpine:v3.16 |
before 4.4-r0 | 4.4-r0 |
ffmpeg4Alpine:v3.17 |
before 4.4-r0 | 4.4-r0 |
ffmpeg4Alpine:v3.18 |
before 4.4-r0 | 4.4-r0 |
ffmpeg4Alpine:v3.19 |
before 4.4-r0 | 4.4-r0 |
ffmpeg4Alpine:v3.20 |
before 4.4-r0 | 4.4-r0 |
ffmpeg4Alpine:v3.21 |
before 4.4-r0 | 4.4-r0 |
ffmpeg4Alpine:v3.22 |
before 4.4-r0 | 4.4-r0 |
FFMPEG_jllJulia |
4.4.0+0 up to 4.4.2+0 | 4.4.2+0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | OSV | |
| affected, aliases, references | OSV | |
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-30123 is a high vulnerability (CVSS 8.8) in Ffmpeg, published April 7, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.43%, the 89th percentile. Fixed in ffmpeg 4.4-r0.
References
trac.ffmpeg.org/ticket/8845
git.videolan.org?p=ffmpeg.git%3Ba=commitdiff%3Bh=d6f293353c94c7ce200f6e0975ae3de49787f91f
security.gentoo.org/glsa/202105-24
nvd.nist.gov/vuln/detail/CVE-2021-30123
github.com/advisories/GHSA-gx3h-4rx7-q328
security.alpinelinux.org/vuln/CVE-2021-30123