If your WhatsApp app and phone's operating system (Android/iOS) are up to date , these specific older vulnerabilities are patched and no longer a threat.
There have been historical cases where hackers used specially crafted on WhatsApp to trigger security vulnerabilities. VID-20221228-WA0279.mp4
Can't download, open, or send media files | WhatsApp Help Center If your WhatsApp app and phone's operating system
If the video came from an unknown sender or looks suspicious, it is safest to delete it without opening it. VID-20221228-WA0279.mp4