CVE-2021-38171
CRITICALCVSS 9.8/10EPSS 2.41%
Last modified
CVE-2021-38171 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 2.41% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Ffmpeg | Ffmpeg | 4.4 |
| Debian | Debian Linux | 9.0 |
| Debian | Debian Linux | 10.0 |
| Debian | Debian Linux | 11.0 |
References
- https://github.com/FFmpeg/FFmpeg/commit/9ffa49496d1aae4cbbb387aac28a9e061a6ab0a6Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/11/msg00012.htmlMailing List, Third Party Advisory
- https://www.debian.org/security/2021/dsa-4990Third Party Advisory
- https://www.debian.org/security/2021/dsa-4998Third Party Advisory
- https://github.com/FFmpeg/FFmpeg/commit/9ffa49496d1aae4cbbb387aac28a9e061a6ab0a6Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/11/msg00012.htmlMailing List, Third Party Advisory
- https://www.debian.org/security/2021/dsa-4990Third Party Advisory
- https://www.debian.org/security/2021/dsa-4998Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-38171?
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.
How severe is CVE-2021-38171?
CVE-2021-38171 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.41% probability of exploitation in the next 30 days.
How do I fix CVE-2021-38171?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2021
- CVE-2021-38165Lynx through 2.8.9 mishandles the userinfo subcomponent of a…5.3
- CVE-2021-38166In kernel/bpf/hashtab.c in the Linux kernel through 5.13.8, …7.8
- CVE-2021-38167Roxy-WI through 5.2.2.0 allows SQL Injection via check_login…9.8
- CVE-2021-38168Roxy-WI through 5.2.2.0 allows authenticated SQL injection v…8.8
- CVE-2021-38169Roxy-WI through 5.2.2.0 allows command injection via /app/fu…8.8
- CVE-2021-3817wbce_cms is vulnerable to Improper Neutralization of Special…9.8
- CVE-2021-38172perM 0.4.0 has a Buffer Overflow related to strncpy. (Debian…9.8
- CVE-2021-38173Btrbk before 0.31.2 allows command execution because of the …9.8
- CVE-2021-38174When a user opens manipulated files received from untrusted …6.5
- CVE-2021-38175SAP Analysis for Microsoft Office - version 2.8, allows an a…6.5
- CVE-2021-38176Due to improper input sanitization, an authenticated user wi…8.8
- CVE-2021-38177SAP CommonCryptoLib version 8.5.38 or lower is vulnerable to…7.5
Are you affected by CVE-2021-38171?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST