Vulnerability · Published Aug 21, 2021 · Assigned by mitre

CVE-2021-38171

Critical 9.8

In plain English

A critical-severity security flaw in the ffmpeg package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.4% (higher than 84% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)9.8Critical

Exploit odds (30 days)2.4%top 15.8% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Alpine:v3.20	ffmpeg	4.4.1-r0	ALPINE-CVE-2021-38171
Alpine:v3.21	ffmpeg	4.4.1-r0	ALPINE-CVE-2021-38171
Alpine:v3.22	ffmpeg	4.4.1-r0	ALPINE-CVE-2021-38171
Alpine:v3.23	ffmpeg	4.4.1-r0	ALPINE-CVE-2021-38171
Alpine:v3.24	ffmpeg	4.4.1-r0	ALPINE-CVE-2021-38171
Alpine:v3.20	ffmpeg4	4.4.1-r0	ALPINE-CVE-2021-38171
Alpine:v3.21	ffmpeg4	4.4.1-r0	ALPINE-CVE-2021-38171
Alpine:v3.22	ffmpeg4	4.4.1-r0	ALPINE-CVE-2021-38171
Debian:12	ffmpeg	7:4.4.1-1	DEBIAN-CVE-2021-38171
Debian:13	ffmpeg	7:4.4.1-1	DEBIAN-CVE-2021-38171
Debian:14	ffmpeg	7:4.4.1-1	DEBIAN-CVE-2021-38171
Ubuntu:22.04:LTS	ffmpeg	7:4.4.2-0ubuntu0.22.04.1	USN-5472-1

Affected products (as reported)

Vendor	Product	Versions
n/a	n/a	n/a

References

https://patchwork.ffmpeg.org/project/ffmpeg/patch/AS8P193MB12542A86E22F8207EC971930B6F19%40AS8P193MB1254.EURP193.PROD.OUTLOOK.COM/
https://github.com/FFmpeg/FFmpeg/commit/9ffa49496d1aae4cbbb387aac28a9e061a6ab0a6
DSA-4990 vendor-advisory
DSA-4998 vendor-advisory
[debian-lts-announce] 20211114 [SECURITY] [DLA 2818-1] ffmpeg security update mailing-list
GLSA-202312-14 vendor-advisory