A Denial of Service vulnerability exists in FFmpeg 4.2 due to a memory leak in the url_open_dyn_buf_internal function in libavformat/aviobu…

published 2021-06-01 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-14810

cvss: 6.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 64%
public exploits: 0; none known

A Denial of Service vulnerability exists in FFmpeg 4.2 due to a memory leak in the url_open_dyn_buf_internal function in libavformat/aviobuf.c.

Patch / fix

distros 4 links 1

debian ubuntu suse opensuse

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

debian advisories DEBIAN-CVE-2020-22044

ffmpeg Ubuntu Pro 16.04 LTS 7:2.8.17-0ubuntu0.1+esm3

ubuntu advisories UBUNTU-CVE-2020-22044

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 +10 more 3.4.2-4.34.2
ffmpeg SLE Workstation Extension 15 SP3, SLE Workstation Extension 15 SP2, SLE Module for Package Hub 15 SP3 +3 more 3.4.2-11.3.1

suse advisories SUSE-SU-2021:2929-1 SUSE-SU-2021:2322-1

ffmpeg openSUSE Leap 15.3 3.4.2-11.3.1

opensuse advisories openSUSE-SU-2021:2322-1

trac.ffmpeg.org/ticket/8295 advisory

Exploit prediction

1.04% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

trac.ffmpeg.org https://trac.ffmpeg.org/ticket/8295 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

Classification

Weakness

CWE-401 Missing Release of Memory after Effective Lifetime

References

trac.ffmpeg.org /ticket/8295
exploit, patch, vendor-advisory
lists.debian.org /debian-lts-announce/2021/11/msg00012.html
mailing-list, third-party-advisory

Sources

CVE List CVE-2020-22044
NVD CVE-2020-22044

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