CVE-2009-3676: The SMB client in the kernel in Microsoft Windows Server 2008 R2 and Windows 7 allows remote SMB servers an...

Security readout for executives and security teams

CVE-2009-3676 can make affected Windows 7 and Windows Server 2008 R2 systems hang when their SMB client processes a malformed response from a remote SMB server or a man-in-the-middle attacker. This is primarily an availability risk, not a disclosed data-theft or code-execution issue. Exposure is most relevant where Windows 7 or Windows Server 2008 R2 systems connect to untrusted SMB servers or traverse networks where SMB traffic could be intercepted. Systems not using SMB client connections to untrusted networks have lower practical exposure. Prioritize remediation for affected legacy systems that use SMB across untrusted or user-controlled networks. The main business risk is outage or instability, so patching and network restriction should be handled through normal vulnerability management unless critical systems are exposed. Mitigation focus: Apply Microsoft security updates referenced in MS10-020 where applicable.; Review Microsoft Security Advisory 977544 for vendor guidance and workarounds.; Limit SMB connections to trusted servers and networks where business permits..

Prepared

Jun 28, 2026, 18:18 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.