Timing difference in password reset in Ergon Informatik AG's Airlock IAM 7.7.9, 8.0.8, 8.1.7, 8.2.4 and 8.3.1 allows unauthenticated attackers to enumerate usernames.
Update to a fixed version such as 7.7.11, 8.0.9, 8.1.8, 8.2.5, 8.3.2.
A password reset flow needs to be configured.