What’s Vulnerable › Vulnerabilities

CVE-2020-21041

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-24 · updated 2026-06-17
• Weakness: CWE-120

Description

Buffer Overflow vulnerability exists in FFmpeg 4.1 via apng_do_inverse_blend in libavcodec/pngenc.c, which could let a remote malicious user cause a Denial of Service

Affected products

• Debian Linux: 9.0, 10.0
• FFmpeg: 4.1

References

• https://lists.debian.org/debian-lts-announce/2021/08/msg00018.html
• https://trac.ffmpeg.org/ticket/7989
• https://www.debian.org/security/2021/dsa-4990
• https://lists.debian.org/debian-lts-announce/2021/08/msg00018.html
• https://trac.ffmpeg.org/ticket/7989
• https://www.debian.org/security/2021/dsa-4990

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