What is CVE-2020-20896?

CVE-2020-20896 is a high-severity vulnerability in Ffmpeg, classified under NULL Pointer Dereference. CVSS score: 8.8/10. Published 2021-09-20.

How severe is CVE-2020-20896?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2020-20896 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

NULL pointer dereference in Ffmpeg

CVE-2020-20896

An issue was discovered in function latm_write_packet in libavformat/latmenc.c in Ffmpeg 4.2.1, allows attackers to cause a Denial of Service or other unspecified impacts due to a Null pointer dereference.

Published 2021-09-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (65.6th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Ffmpeg — versions 4.2.1

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

Public proof-of-concept exploits

akaganeite/CVE4PP

References

trac.ffmpeg.org/ticket/8273 (Exploit, Issue Tracking, Vendor Advisory)
git.ffmpeg.org/gitweb/ffmpeg.git/commit/dd01947397b98e94c3f2a79d5820aaf4594f4d3b (Patch, Mailing List, Vendor Advisory)

Frequently asked questions

What is CVE-2020-20896?: CVE-2020-20896 is a high-severity vulnerability in Ffmpeg, classified under NULL Pointer Dereference. CVSS score: 8.8/10. Published 2021-09-20.
How severe is CVE-2020-20896?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2020-20896 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.