CVE-2020-21697
MEDIUMCVSS 6.5/10EPSS 0.92%
Last modified
CVE-2020-21697 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. A heap-use-after-free in the mpeg_mux_write_packet function in libavformat/mpegenc.c of FFmpeg 4.2 allows to cause a denial of service (DOS) via a crafted avi file.. EPSS estimates a 0.92% chance of exploitation in the next 30 days.
Description
A heap-use-after-free in the mpeg_mux_write_packet function in libavformat/mpegenc.c of FFmpeg 4.2 allows to cause a denial of service (DOS) via a crafted avi file.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Ffmpeg | Ffmpeg | 4.2 |
| Debian | Debian Linux | 11.0 |
References
- https://trac.ffmpeg.org/ticket/8188Exploit, Issue Tracking, Patch, Vendor Advisory
- https://www.debian.org/security/2021/dsa-4998Third Party Advisory
- https://trac.ffmpeg.org/ticket/8188Exploit, Issue Tracking, Patch, Vendor Advisory
- https://www.debian.org/security/2021/dsa-4998Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-21697?
A heap-use-after-free in the mpeg_mux_write_packet function in libavformat/mpegenc.c of FFmpeg 4.2 allows to cause a denial of service (DOS) via a crafted avi file.
How severe is CVE-2020-21697?
CVE-2020-21697 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.92% probability of exploitation in the next 30 days.
How do I fix CVE-2020-21697?
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.
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Are you affected by CVE-2020-21697?
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Scan your code nowSource: NVD / NIST