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Fencer Vulns
high 7.5

CVE-2021-38291 json

FFmpeg version (git commit de8e6e67e7523e48bb27ac224a0b446df05e1640) suffers from a an assertion...

published 2021-08-12 5 y ago modified 2026-07-23 3 mo ago also EUVD-2021-24749 , JLSEC-2025-117

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

FFmpeg version (git commit de8e6e67e7523e48bb27ac224a0b446df05e1640) suffers from a an assertion failure at src/libavutil/mathematics.c.

Patch / fix

  • julia FFMPEG_jll 4.3.1+0, 4.4.0+0
  • julia FFplay_jll 4.4.4+0
  • ffmpeg ffmpeg 4.1.7, 4.2.5, 4.3.3, 4.4.1
  • ffmpeg Debian 14, Debian 13, Debian 12 7:4.4.1-1

debian advisories DEBIAN-CVE-2021-38291

  • ffmpeg Ubuntu 18.04 LTS 7:3.4.11-0ubuntu0.1
  • ffmpeg Ubuntu 20.04 LTS 7:4.2.7-0ubuntu0.1
  • ffmpeg Ubuntu Pro 16.04 LTS 7:2.8.17-0ubuntu0.1+esm4

ubuntu advisories UBUNTU-CVE-2021-38291

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ffmpeg SLE Workstation Extension 15 SP6, SLE Workstation Extension 15 SP5, SLE Module for Package Hub 15 SP6 +5 more 3.4.2-150200.11.57.1

suse advisories SUSE-SU-2024:3114-1

  • ffmpeg Alpine 3.13 4.3.3-r0
  • ffmpeg Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 4.4.1-r0
  • ffmpeg4 Alpine 3.22, Alpine 3.21, Alpine 3.20 +4 more 4.4.1-r0

alpine advisories ALPINE-CVE-2021-38291

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ffmpeg Arch Linux 2:4.4.1-1

arch linux advisories AVG-1989

Exploit prediction

2.69% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • trac.ffmpeg.org https://trac.ffmpeg.org/ticket/9312 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia FFMPEG_jll
<4.3.1+0
>=4.3.1+2, <4.4.0+0
4.3.1+0
4.4.0+0
julia FFplay_jll
<4.4.4+0
4.4.4+0

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.