Weak Password Requirements
etcd versions prior to 3.3.23 and 3.4.x prior to 3.4.10 do not perform any password length validation, which allows for very short passwords, such as those with a length of one. This may allow an attacker to guess or brute-force users' passwords with little computational effort.
CWE-521 - Weak Password Requirements
The product does not require that users should have strong passwords, which makes it easier for attackers to compromise user accounts.