What’s Vulnerable › Vulnerabilities

CVE-2009-1491

• Severity: critical (CVSS 9.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2009-05-05 · updated 2026-06-16
• Weakness: CWE-20

Description

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: all versions

References

• http://www.nmrc.org/~thegnome/blog/apr09/
• https://exchange.xforce.ibmcloud.com/vulnerabilities/50354
• http://www.nmrc.org/~thegnome/blog/apr09/
• https://exchange.xforce.ibmcloud.com/vulnerabilities/50354

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