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Fencer Vulns
high 7.5

CVE-2020-35965 json

`decode_frame` in `libavcodec/exr.c` in FFmpeg 4.3.1 has an out-of-bounds write because of errors in...

published 2021-01-04 5 y ago modified 2026-07-23 3 mo ago also EUVD-2020-23548 , JLSEC-2025-111

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

decode_frame in libavcodec/exr.c in FFmpeg 4.3.1 has an out-of-bounds write because of errors in calculations of when to perform memset zero operations.

Patch / fix

  • julia FFMPEG_jll 4.4.0+0
  • julia FFplay_jll 4.4.4+0
  • ffmpeg ffmpeg 4.4
  • ffmpeg Debian 14, Debian 13, Debian 12 7:4.3.1-6

debian advisories DEBIAN-CVE-2020-35965

  • 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-2020-35965

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 SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 3.4.2-150000.4.44.1
  • ffmpeg SLE Workstation Extension 15 SP3, SLE Workstation Extension 15 SP2, SLE Module for Package Hub 15 SP3 +3 more 3.4.2-11.17.1

suse advisories SUSE-SU-2023:0005-1SUSE-SU-2021:3521-1

  • ffmpeg openSUSE Leap 15.3 3.4.2-11.17.1

opensuse advisories openSUSE-SU-2021:3521-1

  • ffmpeg Alpine 3.13 4.3.1-r4
  • 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-2020-35965

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

arch linux advisories AVG-1397

Exploit prediction

2.31% chance of exploitation in the next 30 days, higher than 83% 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=26532 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+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.