Zimbra Collaboration Open Source 8.8.15 does not encrypt the initial-login randomly created password (from the "zmprove ca" command). It is visible in cleartext on port UDP 514 (aka the syslog port). NOTE: a third party reports that this cannot be reproduced.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.017
EPSS Ranking 81.5%