CVE-2008-5424: Microsoft Outlook Express

Medium severity, CVSS 4.3. EPSS: 12.3% chance of exploitation in the next 30 days.

The MimeOleClearDirtyTree function in InetComm.dll in Microsoft Outlook Express 6.00.2900.5512 does not properly handle (1) multipart/mixed e-mail messages with many MIME parts and possibly (2) e-mail messages with many "Content-type: message/rfc822;" headers, which allows remote attackers to cause a denial of service (infinite loop) via a large e-mail message, a related issue to CVE-2006-1173.

Affected products

• Microsoft Outlook Express: version 6.00.2900.5512 only

Published 2008-12-11. Last modified 2026-06-16.