Information disclosure in Ffmpeg
CVE-2021-3566
Prior to ffmpeg version 4.3, the tty demuxer did not have a 'read_probe' function assigned to it. By crafting a legitimate "ffconcat" file that references an image, followed by a file the triggers the tty demuxer, the contents of the second file will be copied into the output file verbatim (as long as the `-vcodec copy` option is passed to ffmpeg).
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.009 (57.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Ffmpeg
- Debian Linux — versions 9.0
- Ffmpeg — versions ffmpeg 4.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/FFmpeg/FFmpeg/commit/3bce9e9b3ea35c54bacccc793d7da99ea5157532 (Patch, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/08/msg00018.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-3566?
- CVE-2021-3566 is a medium-severity vulnerability in Ffmpeg, classified under Information Disclosure. CVSS score: 5.5/10. Published 2021-08-05.
- How severe is CVE-2021-3566?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2021-3566 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.