A heap-based Buffer Overflow vulnerability exists in FFmpeg 4.2 in filter_intra at libavfilter/vf_bwdif.c, which might lead to memory corru…

published 2021-06-01 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-14802

cvss: 8.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.7%; EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits: 0; none known

A heap-based Buffer Overflow vulnerability exists in FFmpeg 4.2 in filter_intra at libavfilter/vf_bwdif.c, which might lead to memory corruption and other potential consequences.

Patch / fix

distros 2

debian ubuntu

ffmpeg Debian 14, Debian 13, Debian 12 7:4.3-2

debian advisories DEBIAN-CVE-2020-22036

ffmpeg Ubuntu 18.04 LTS 7:3.4.11-0ubuntu0.1
ffmpeg Ubuntu 20.04 LTS 7:4.2.7-0ubuntu0.1

ubuntu advisories UBUNTU-CVE-2020-22036

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

Exploit prediction

1.73% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

trac.ffmpeg.org https://trac.ffmpeg.org/ticket/8261 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness

CWE-787 Out-of-bounds Write

References

trac.ffmpeg.org /ticket/8261
exploit, vendor-advisory
debian.org /security/2021/dsa-4990
vendor-advisory, third-party-advisory
lists.debian.org /debian-lts-announce/2021/08/msg00018.html
mailing-list, third-party-advisory

Sources

CVE List CVE-2020-22036
NVD CVE-2020-22036

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.

Summary