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Fencer Vulns
medium 5.5

CVE-2020-13904 json

FFmpeg 2.8 and 4.2.3 has a use-after-free via a crafted EXTINF duration in an m3u8 file because parse_playlist in libavformat/hls.c frees a…

published 2020-06-07 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-6112

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

FFmpeg 2.8 and 4.2.3 has a use-after-free via a crafted EXTINF duration in an m3u8 file because parse_playlist in libavformat/hls.c frees a pointer, and later that pointer is accessed in av_probe_input_format3 in libavformat/format.c.

Patch / fix

  • ffmpeg Debian 14, Debian 13, Debian 12 7:4.3.1-1

debian advisories DEBIAN-CVE-2020-13904

  • ffmpeg Ubuntu 16.04 LTS 7:2.8.17-0ubuntu0.1
  • ffmpeg Ubuntu 18.04 LTS 7:3.4.8-0ubuntu0.2
  • ffmpeg Ubuntu 20.04 LTS 7:4.2.4-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2020-13904

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

  • ffmpeg openSUSE Leap 15.3 3.4.2-11.3.1

opensuse advisories openSUSE-SU-2021:2322-1

  • ffmpeg Alpine 3.10 4.1.6-r0
  • ffmpeg Alpine 3.11 4.2.4-r0
  • ffmpeg Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 4.3-r0
  • ffmpeg Alpine 3.9 4.0.6-r0
  • ffmpeg4 Alpine 3.22, Alpine 3.21, Alpine 3.20 +4 more 4.3-r0

alpine advisories ALPINE-CVE-2020-13904

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 2:4.3.1-1

arch linux advisories AVG-1180

Exploit prediction

1.32% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • trac.ffmpeg.org https://trac.ffmpeg.org/ticket/8673 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/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

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.