Microsoft Exchange 5.5 vulnerabilities

Modifications to Access Control Lists (ACLs) in Microsoft Exchange 5.5 do not take effect until the directory store cache is refreshed.

Microsoft Exchange 5.5 allows a remote attacker to relay email (i.e. spam) using encapsulated SMTP addresses, even if the anti-relaying features are enabled.

A vulnerability in Microsoft Exchange allows for remote code execution, potentially leading to system takeover. An attacker can exploit this flaw to execute arbitrary code on the Exchange server.