CVE-2010-0816: Microsoft Outlook Express

High severity, CVSS 9.3. EPSS: 20.3% chance of exploitation in the next 30 days.

Integer overflow in inetcomm.dll in Microsoft Outlook Express 5.5 SP2, 6, and 6 SP1; Windows Live Mail on Windows XP SP2 and SP3, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7; and Windows Mail on Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7 allows remote e-mail servers and man-in-the-middle attackers to execute arbitrary code via a crafted (1) POP3 or (2) IMAP response, as demonstrated by a certain +OK response on TCP port 110, aka "Outlook Express and Windows Mail Integer Overflow Vulnerability."

Affected products

• Microsoft Outlook Express: version 5.5 only; version 6.0 only
• Microsoft Windows Live Mail: any version
• Microsoft Windows Mail: any version

Published 2010-05-12. Last modified 2026-06-16.