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Fencer Vulns
medium 6.5

CVE-2020-20445 json

FFmpeg 4.2 is affected by a Divide By Zero issue via libavcodec/lpc.h, which allows a remote malicious user to cause a Denial of Service.

published 2021-05-25 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-13232

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 76%
public exploits
0
none known

Summary

FFmpeg 4.2 is affected by a Divide By Zero issue via libavcodec/lpc.h, which allows a remote malicious user to cause a Denial of Service.

Patch / fix

  • ffmpeg Debian 14, Debian 13, Debian 12 7:5.0.1-2

debian advisories DEBIAN-CVE-2020-20445

  • 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+esm1

ubuntu advisories UBUNTU-CVE-2020-20445

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 Arch Linux 2:4.4.1-1

arch linux advisories AVG-1989

Exploit prediction

1.65% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • trac.ffmpeg.org https://trac.ffmpeg.org/ticket/7996 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:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.0 AV:N/AC:L/Au:S/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.