Remedy AR System Server in BMC Remedy 8.1 SP 2, 9.0, 9.0 SP 1, and 9.1 allows attackers to reset arbitrary passwords via a blank previous password.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-3433
https://bmcsites.force.com/casemgmt/sc_KnowledgeArticle?sfdcid=kA214000000l6kbCAA&type=Solution