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Fencer Vulns
high 8.8

CVE-2020-20891 json

Buffer Overflow vulnerability in function config_input in libavfilter/vf_gblur.c in Ffmpeg 4.2.1, allows attackers to cause a Denial of Ser…

published 2021-09-20 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-13671

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

Summary

Buffer Overflow vulnerability in function config_input in libavfilter/vf_gblur.c in Ffmpeg 4.2.1, allows attackers to cause a Denial of Service or other unspecified impacts.

Patch / fix

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

debian advisories DEBIAN-CVE-2020-20891

  • 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

Exploit prediction

1.24% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • trac.ffmpeg.org https://trac.ffmpeg.org/ticket/8282 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-120 Buffer Copy without Checking Size of Input

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.