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Windows NT SNMP agent leaks memory

Vulnerability Note VU#4923

Original Release Date: 2001-11-15 | Last Revised: 2001-11-15


The Microsoft SNMP agent, prior to Windows NT 4.0 Service Pack 4.0, will leak memory.


Microsoft's SNMP agent, snmp.exe, priot to Windows NT 4.0 Service Pack 4.0, will leak memory if the OID cannot be decoded. Quoting from Microsoft KB article Q178381,

If SNMP cannot decode an OID from a network packet, SNMP does not free up the memory, resulting in a memory leak in the Snmp.exe processes. The impact of this leak will be more evident on a system running on a network segment that receive lots of SNMP broadcast traffic.

An intruder can craft a malicious SNMP packet and consume memory on a victim host.

This problem was addressed by Microsoft in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.


Intruders can consume memory on vulnerable machines, causing denial or degredation of service.


Upgrade to Windows NT service pack 4 or later, as described in

Vendor Information


Microsoft Affected

Notified:  April 16, 1998 Updated: November 15, 2001



Vendor Statement


Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

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Our thanks to Microsoft for the information in their Knowledgebase.

This document was written by Shawn V Hernan.

Other Information

CVE IDs: None
Severity Metric: 1.90
Date Public: 1998-03-24
Date First Published: 2001-11-15
Date Last Updated: 2001-11-15 05:48 UTC
Document Revision: 7

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