CVE-2021-38171

highpriority · track · 40EPSS 0.024 · 84 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

2.41% (84th) EPSS

CVSS 7.5 · high

Is it mine?

26 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-26

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.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-252USprimaryCWE-252US

affected products (26)

Products and version ranges known to be affected.

Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Gentoo Linuxall versionscert_bundDEcpe:/o:gentoo:linux:-
Open Source ffmpeg 4.4all versionscert_bundDEcpe:/a:ffmpeg:ffmpeg:4.4
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
n/a n/a≤ n/aenisa_euvdEU
FFmpeg team FFmpeg≤ 2.8.18fstec_bduRU
FFmpeg team FFmpeg3.0 → 3.2.16fstec_bduRU
FFmpeg team FFmpeg3.3 → 3.4.9fstec_bduRU
FFmpeg team FFmpeg4.0 → 4.1.7fstec_bduRU
FFmpeg team FFmpeg4.2 → 4.2.5fstec_bduRU
FFmpeg team FFmpeg4.3 → 4.3.3fstec_bduRU
FFmpeg team FFmpeg4.4 → 4.4.1fstec_bduRU
АО «ИВК» Альт 8 СПall versionsfstec_bduRU
АО «НППКТ» ОСОН ОСнова Оnyx≤ 2.4fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.7fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 4.7fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.6 «Смоленск»fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition для «Эльбрус»≤ 8.1 «Ленинград»fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 10fstec_bduRU

showing 20 of 26

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2022-0218ffmpeg: Schwachstelle ermöglicht PrivilegieneskalationDeutsch2021-08-30csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in ffmpeg ausnutzen, um seine Privilegien zu erhöhen.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund NVD CVE.org MITRE

published 2021-08-21modified 2026-06-17

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+326 more

references (26)

External citations — patches, advisories, analysis.

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