CVE-2021-38171

CRITICAL

FFmpeg 4.4 - Buffer Overflow

Title source: llm

Description

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.

References (6)

[Patch, Third Party Advisory] https://github.com/FFmpeg/FFmpeg/commit/9ffa49496d1aae4cbbb387aac28a9e061a6ab0a6

View Patch ZIP pw:eip

[Mailing List, Third Party Advisory] https://lists.debian.org/debian-lts-announce/2021/11/msg00012.html

[Various Sources] https://patchwork.ffmpeg.org/project/ffmpeg/patch/AS8P193MB12542A86E22F8207EC971930B6F19%40AS8P193MB1254.EURP193.PROD.OUTLOOK.COM/

[Third Party Advisory] https://www.debian.org/security/2021/dsa-4990

[Third Party Advisory] https://www.debian.org/security/2021/dsa-4998

[Third Party Advisory] https://security.gentoo.org/glsa/202312-14

Scores

CVSS v3 9.8

EPSS 0.0021

EPSS Percentile 43.1%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Classification

CWE

CWE-252

Status published

Affected Products (4)

ffmpeg/ffmpeg

debian/debian_linux

Timeline

Published Aug 21, 2021

Tracked Since Feb 18, 2026