CVE-2007-0039: Microsoft Exchange Server

High severity, CVSS 7.8. EPSS: 44.6% chance of exploitation in the next 30 days.

The Exchange Collaboration Data Objects (EXCDO) functionality in Microsoft Exchange Server 2000 SP3, 2003 SP1 and SP2, and 2007 allows remote attackers to cause a denial of service (crash) via an Internet Calendar (iCal) file containing multiple X-MICROSOFT-CDO-MODPROPS (MODPROPS) properties in which the second MODPROPS is longer than the first, which triggers a NULL pointer dereference and an unhandled exception.

Affected products

• Microsoft Exchange Server: version 2000 only; version 2003 only; version 2007 only

Published 2007-05-08. Last modified 2026-06-16.