CVE-2015-8661: Ffmpeg

High severity, CVSS 8.3. EPSS: 1.9% chance of exploitation in the next 30 days.

The h264_slice_header_init function in libavcodec/h264_slice.c in FFmpeg before 2.8.3 does not validate the relationship between the number of threads and the number of slices, which allows remote attackers to cause a denial of service (out-of-bounds array access) or possibly have unspecified other impact via crafted H.264 data.

Affected products

• Ffmpeg Ffmpeg: up to and including 2.8.2

Published 2015-12-24. Last modified 2026-06-17.