Vulnerability · Published Aug 10, 2021 · Assigned by mitre
CVE-2020-21697
Medium 6.5
In plain English
A medium-severity security flaw in the ffmpeg package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)0.9%top 39.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | ffmpeg | 7:4.4-5 | DEBIAN-CVE-2020-21697 |
| Debian:13 | ffmpeg | 7:4.4-5 | DEBIAN-CVE-2020-21697 |
| Debian:14 | ffmpeg | 7:4.4-5 | DEBIAN-CVE-2020-21697 |
| Ubuntu:22.04:LTS | ffmpeg | 7:4.4.2-0ubuntu0.22.04.1 | USN-5472-1 |
| Ubuntu:25.10 | qtwebengine-opensource-src | no fix listed | UBUNTU-CVE-2020-21697 |
| Ubuntu:26.10 | qtwebengine-opensource-src | no fix listed | UBUNTU-CVE-2020-21697 |
Affected products (as reported)
References
- https://trac.ffmpeg.org/ticket/8188 x_refsource_MISC
- DSA-4998 vendor-advisory, x_refsource_DEBIAN