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The vulnerability exists because a component of the Simple Network Management Protocol (SNMP) agent service that interprets incoming commands contains an unchecked buffer (a temporary data storage area that has a limited capacity). By sending a specially malformed request, it is possible to carry out a buffer overrun attack against an affected system.
Note The SNMP service is neither installed nor running by default in any version of Windows.
For more information about this vulnerability, read Microsoft Security Bulletin MS02-006.