FFmpeg version n6.1 was discovered to contain a heap buffer overflow vulnerability in the draw_block_rectangle function of libavfilter/vf_codecview.c. This vulnerability allows attackers to cause undefined behavior or a Denial of Service (DoS) via crafted input.
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().