CVE-2018-13305: Ffmpeg

High severity, CVSS 8.1. EPSS: 1.4% chance of exploitation in the next 30 days.

In FFmpeg 4.0.1, due to a missing check for negative values of the mquant variable, the vc1_put_blocks_clamped function in libavcodec/vc1_block.c may trigger an out-of-array access while converting a crafted AVI file to MPEG4, leading to an information disclosure or a denial of service.

Affected products

• Ffmpeg Ffmpeg: version 4.0.1 only

Published 2018-07-05. Last modified 2026-06-17.