There is 1 open security issue in bullseye.
1 issue left for the package maintainer to handle:
PuTTY through 0.75 proceeds with establishing an SSH session even if it has never sent a substantive authentication response. This makes it easier for an attacker-controlled SSH server to present a later spoofed authentication prompt (that the attacker can use to capture credential data, and use that data for purposes that are undesired by the client user).
You can find information about how to handle this issue in the security team's documentation.