Zimbra, a widely used email and collaboration platform, recently released a critical security update addressing a severe vulnerability in its postjournal service. This vulnerability, identified as CVE-2024-45519, allows unauthenticated attackers to execute arbitrary commands on affected Zimbra installations. In this blog post, we delve into the nature of this vulnerability, our journey in analyzing the patch, and the steps we took to exploit it manually. We also discuss the potential impact and emphasize the importance of timely patch application.