There's an out-of-bounds read flaw in Vim's ex_docmd.c. An attacker who is capable of tricking a user into opening a specially crafted file could trigger an out-of-bounds read on a memmove operation, potentially causing an impact to application availability.
Denial Of Service (DoS)
Heap-based Buffer Overflow in vim/vim
CVE-2021-3875 affecting package vim 8.2.3441-2
Amazon Linux 2 : vim (ALAS-2021-1728)