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Fencer Vulns
medium 6.5

CVE-2020-35964 json

`track_header` in `libavformat/vividas.c` in FFmpeg 4.3.1 has an out-of-bounds write because of...

published 2021-01-03 5 y ago modified 2026-07-23 3 mo ago also EUVD-2020-23547 , JLSEC-2025-110

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

track_header in libavformat/vividas.c in FFmpeg 4.3.1 has an out-of-bounds write because of incorrect extradata packing.

Patch / fix

  • julia FFMPEG_jll 4.4.0+0
  • julia FFplay_jll 4.4.4+0
  • ffmpeg Debian 14, Debian 13, Debian 12 7:4.3.1-6

debian advisories DEBIAN-CVE-2020-35964

  • ffmpeg Ubuntu 20.04 LTS 7:4.2.7-0ubuntu0.1

ubuntu advisories UBUNTU-CVE-2020-35964

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-4 openSUSE Tumbleweed 4.4-5.2

opensuse advisories openSUSE-SU-2024:10754-1

  • ffmpeg Alpine 3.13 4.3.3-r0
  • ffmpeg Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 4.3.2-r0
  • ffmpeg4 Alpine 3.22, Alpine 3.21, Alpine 3.20 +4 more 4.3.2-r0

alpine advisories ALPINE-CVE-2020-35964

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 2:4.3.2-1

arch linux advisories AVG-1649

Exploit prediction

1.54% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugs.chromium.org https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26622 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P
OSV 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia FFMPEG_jll
>=4.3.1+2, <4.4.0+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.