Use After Free in Ffmpeg
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.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.009 (58.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.9% 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 — versions 4.2
- Debian Linux — versions 11.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- trac.ffmpeg.org/ticket/8188 (Exploit, Patch, Issue Tracking, Vendor Advisory)
- www.debian.org/security/2021/dsa-4998 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-21697?
- CVE-2020-21697 is a medium-severity vulnerability in Ffmpeg, classified under Use After Free. CVSS score: 6.5/10. Published 2021-08-10.
- How severe is CVE-2020-21697?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2020-21697 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.