CVE-2020-21688
CVSS v3
8.8
HIGH
EPSS Score
1.7 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical details
- Published
- 2021-08-10
Frequently asked questions
What is 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.
Is CVE-2020-21688 actively exploited?
Active exploitation of CVE-2020-21688 has not been confirmed. Its EPSS score was 1.7% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2020-21688?
CVE-2020-21688 has a CVSS v3 base score of 8.8 (HIGH severity).
Is CVE-2020-21688 affecting your environment?
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