Open Redirect vulnerability exists in IceWarp MailServer IceWarp Server Deep Castle 2 Update 1 (13.0.1.2) via the referer parameter.
https://medium.com/@rohitgautam26/cve-2021-36580-69219798231c
https://medium.com/%40rohitgautam26/cve-2021-36580-69219798231c