CVE-2003-0300: Microsoft Outlook Express

Medium severity, CVSS 5.0. EPSS: 3.4% chance of exploitation in the next 30 days.

The IMAP Client for Sylpheed 0.8.11 allows remote malicious IMAP servers to cause a denial of service (crash) via certain large literal size values that cause either integer signedness errors or integer overflow errors.

Affected products

• Microsoft Outlook Express: version 6.00.2800.1106 only
• Mozilla Mozilla: version 1.3 only; version 1.4 only
• Mutt Mutt: version 1.4.1 only
• Qualcomm Eudora: version 5.2.1 only
• Stuart Parmenter Balsa: version 2.0.10 only
• Sylpheed Sylpheed Email Client: version 0.8.11 only
• University Of Washington Pine: version 4.53 only
• Ximian Evolution: version 1.2.4 only

Published 2003-06-16. Last modified 2026-06-16.