Vulnerability in Ffmpeg

CVE-2021-38171

adts_decode_extradata in libavformat/adtsenc.c in FFmpeg 4.4 does not check the init_get_bits return value, which is a necessary step because the second argument to init_get_bits can be crafted.

EPSS: 0.024 (82.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2021-38171?
CVE-2021-38171 is a critical-severity vulnerability in Ffmpeg, classified under CWE-252. CVSS score: 9.8/10. Published 2021-08-21.
How severe is CVE-2021-38171?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-38171 known to be exploited?
4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.