Outlook Express BCC: Recipient Disclosure

Medium Nessus Network Monitor Plugin ID 2150


The remote email client is vulnerable to a flaw where the 'BCC' address is not hidden.


The remote host is using Outlook Express version 6.00 or 6.00 SP1. It is reported that the effectiveness of the BCC: field in these versions cannot be trusted. People receiving the mail through the To: and CC: fields can find the invisible receipients by opening the mail in a text editor.


Upgrade or patch according to vendor recommendations.

Plugin Details

Severity: Medium

ID: 2150

Family: SMTP Clients

Published: 2004/08/18

Modified: 2016/11/23

Dependencies: 1332

Risk Information

Risk Factor: Medium


Base Score: 5

Temporal Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

Temporal Vector: CVSS2#E:H/RL:U/RC:C


Base Score: 5.3

Temporal Score: 5.3


Temporal Vector: CVSS3#E:H/RL:U/RC:C

Vulnerability Information

CPE: cpe:/a:microsoft:outlook_express

Reference Information

CVE: CVE-2004-2137

BID: 11040