CVE-2009-1491: McAfee Groupshield

High severity, CVSS 9.3. EPSS: 2.8% chance of exploitation in the next 30 days.

McAfee GroupShield for Microsoft Exchange on Exchange Server 2000, and possibly other anti-virus or anti-spam products from McAfee or other vendors, does not scan X- headers for malicious content, which allows remote attackers to bypass virus detection via a crafted message, as demonstrated by a message with an X-Testing header and no message body.

Affected products

• McAfee Groupshield: any version

Published 2009-05-05. Last modified 2026-06-16.