CVE-2021-38171: debian debian_linux Unchecked Return Value
CVSS: 9.8v3.1CriticalModified
AliasesSUSE-SU-2021:3193-1SUSE-SU-2021:3212-1UBUNTU-CVE-2021-38171DEBIAN-CVE-2021-38171openSUSE-SU-2021:3193-1
Published 21-08-2021Last modified 04-08-2024
Vulnerability summary
CVE-2021-38171 is a critical (CVSS 9.8) Unchecked Return Value vulnerability in debian debian_linux. EPSS estimates a 2.41% chance of exploitation in the next 30 days, higher than 83.8% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.1 (NVD)EPSS score
2.41%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 7 · Related 3Timeline
- 21-08-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 3 sources · 2 versionsCritical 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
High 7.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
2.41%
Chance of exploitation in the next 30 days
Percentile
84%
Versus all other CVEs
30-day change
0.00 pp
From 2.41% on 19-09-2026
19-09-202619-10-2026
EPSS score2.41%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Suse16 products
- ffmpeg&distro=SUSE Enterprise Storage 6< 3.4.2-4.37.1
- ffmpeg&distro=SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS< 3.4.2-4.37.1
- ffmpeg&distro=SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS< 3.4.2-4.37.1
- ffmpeg&distro=SUSE Linux Enterprise High Performance Computing 15-ESPOS< 3.4.2-4.37.1
- ffmpeg&distro=SUSE Linux Enterprise High Performance Computing 15-LTSS< 3.4.2-4.37.1
Debian2 products
- ffmpeg< 7:4.4.1-1
- debian_linuxEOL9.0 | 10.0 | 11.0
Ffmpeg1 product
- ffmpeg4.4
Opensuse1 product
- ffmpeg&distro=openSUSE Leap 15.3< 3.4.2-11.11.1
Ubuntu1 product
- ffmpeg< 7:2.8.17-0ubuntu0.1+esm4 | < 7:3.4.11-0ubuntu0.1 | < 7:4.2.7-0ubuntu0.1
5 vendors · 21 products
References
17 links- github.com/FFmpeg/FFmpeg/commit/9ffa49496d1aae4cbbb387aac28a9e061a6ab0a6REPORTPatchThird Party Advisory
- security.gentoo.org/glsa/202312-14Vendor Advisory
Show all 17 references
- lists.opensuse.org/archives/…Advisory