Vulnerability · Published Aug 10, 2021 · Assigned by mitre
CVE-2020-21688
High 8.8
In plain English
A high-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 1.7% (higher than 78% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)8.8High
Exploit odds (30 days)1.7%top 22.3% 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 av_freep function in libavutil/mem.c of FFmpeg 4.2 allows attackers to execute arbitrary code.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | ffmpeg | 7:4.4-5 | DEBIAN-CVE-2020-21688 |
| Debian:13 | ffmpeg | 7:4.4-5 | DEBIAN-CVE-2020-21688 |
| Debian:14 | ffmpeg | 7:4.4-5 | DEBIAN-CVE-2020-21688 |
| 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-2020-21688 |
| Ubuntu:26.10 | qtwebengine-opensource-src | no fix listed | UBUNTU-CVE-2020-21688 |
Affected products (as reported)
References
- https://trac.ffmpeg.org/ticket/8186 x_refsource_MISC
- DSA-4998 vendor-advisory, x_refsource_DEBIAN