Raspberry Pi OS through 5.10 has the raspberry default password for the pi account. If not changed, attackers can gain administrator privileges.
packetstormsecurity.com/files/165211/Raspberry-Pi-5.10-Default-Credentials.html
arstechnica.com/gadgets/2022/04/raspberry-pi-os-axes-longstanding-default-user-account-in-the-name-of-security/
www.cnvd.org.cn/flaw/show/CNVD-2021-43968
www.raspberrypi.com/documentation/computers/configuration.html#change-the-default-password