Microsoft Outlook 2002 using V1 Exchange Server Security certificates transmits plaintext emails

outlook-v1-certificate-plaintext (11133) The risk level is classified as LowLow Risk


Microsoft Outlook could allow email to be transmitted in plain text without the user's knowledge. A remote attacker with access to the mail server or with the ability to intercept email while it is being transmitted could use this vulnerability to read unencrypted emails, and possibly obtain sensitive information.


Obtain Information


Apply the patch for this vulnerability, as listed in Microsoft Security Bulletin MS04-009. See References.

Note: Microsoft originally provided a patch for this vulnerability in MS03-003, but it was superseded and then superseded by the patch released with MS04-009. See References.


  • CIAC Information Bulletin N-035: Microsoft V1 Exchange Server Security Certificates Vulnerability.
  • Microsoft Security Bulletin MS03-003: Flaw in how Outlook 2002 handles V1 Exchange Server Security Certificates could lead to Information Disclosure (812262).
  • Microsoft Security Bulletin MS04-009: Vulnerability in Microsoft Outlook Could Allow Code Execution (828040).
  • BID-6667: Microsoft Outlook 2002 V1 Exchange Server Security Certificate Information Leakage Vulnerability
  • BID-668: Microsoft MSN Setup BBS ActiveX Control Buffer Overflow Vulnerability
  • CVE-2003-0007: Microsoft Outlook 2002 does not properly handle requests to encrypt email messages with V1 Exchange Server Security certificates, which causes Outlook to send the email in plaintext, aka Flaw in how Outlook 2002 handles V1 Exchange Server Security Certificates could lead to Information Disclosure.
  • OSVDB ID: 11424: Microsoft Outlook V1 Exchange Server Security Certificate Cleartext Transmission

Platforms Affected:

  • Microsoft Outlook 2002


Jan 22, 2003

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