What’s Vulnerable › Vulnerabilities

CVE-2020-21688

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-10 · updated 2026-06-17
• Weakness: CWE-416

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 products

• Debian Linux: 11.0
• FFmpeg: 4.2

References

• https://trac.ffmpeg.org/ticket/8186
• https://www.debian.org/security/2021/dsa-4998
• https://trac.ffmpeg.org/ticket/8186
• https://www.debian.org/security/2021/dsa-4998

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