Use After Free in Ffmpeg
CVE-2020-21688
A heap-use-after-free in the av_freep function in libavutil/mem.c of FFmpeg 4.2 allows attackers to execute arbitrary code.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.017 (76.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · 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/8186 (Exploit, Patch, Issue Tracking, Vendor Advisory)
- www.debian.org/security/2021/dsa-4998 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-21688?
- CVE-2020-21688 is a high-severity vulnerability in Ffmpeg, classified under Use After Free. CVSS score: 8.8/10. Published 2021-08-10.
- How severe is CVE-2020-21688?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2020-21688 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.