CVE-2020-21688: Debian Linux

High severity, CVSS 8.8. EPSS: 1.7% chance of exploitation in the next 30 days.

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 products

• Debian Debian Linux: version 11.0 only
• Ffmpeg Ffmpeg: version 4.2 only

Published 2021-08-10. Last modified 2026-06-17.