CVE-2021-38171

Publication date 21 August 2021

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
ffmpeg	22.04 LTS jammy	Not affected
	21.10 impish	Fixed 7:4.4.2-0ubuntu0.21.10.1
	21.04 hirsute	Ignored end of life
	20.04 LTS focal	Fixed 7:4.2.7-0ubuntu0.1
	18.04 LTS bionic	Fixed 7:3.4.11-0ubuntu0.1
	16.04 LTS xenial	Fixed 7:2.8.17-0ubuntu0.1+esm4
	14.04 LTS trusty	Not in release

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
ffmpeg	Upstream: 9ffa494

Severity score breakdown

Parameter	Value
Base score	9.8 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H