What’s Vulnerable › Vulnerabilities

CVE-2004-0840

• Severity: critical (CVSS 10.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 30.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2004-11-03 · updated 2026-06-16
• Weakness: CWE-20

Description

The SMTP (Simple Mail Transfer Protocol) component of Microsoft Windows XP 64-bit Edition, Windows Server 2003, Windows Server 2003 64-bit Edition, and the Exchange Routing Engine component of Exchange Server 2003, allows remote attackers to execute arbitrary code via a malicious DNS response message containing length values that are not properly validated.

Affected products

• Microsoft Exchange Server: 2003
• Microsoft Windows Server 2003: r2
• Microsoft Windows XP Service Pack 3: all versions

References

• http://www.kb.cert.org/vuls/id/394792
• http://www.securityfocus.com/bid/11374
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2004/ms04-035
• https://exchange.xforce.ibmcloud.com/vulnerabilities/17621
• https://exchange.xforce.ibmcloud.com/vulnerabilities/17660
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A2300
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A3460
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5509
• http://www.kb.cert.org/vuls/id/394792
• http://www.securityfocus.com/bid/11374
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2004/ms04-035
• https://exchange.xforce.ibmcloud.com/vulnerabilities/17621

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