Disclosed are various embodiments of method and system for network access control. The method may involve traffic monitoring and vulnerability detection using process information. The system may analyze the vulnerability as a process malfunctioning where preventive action focuses on process blocking as opposed to host blocking, which can lead to improved performance and productivity of a network. Techniques may use process related information, connection information, and network packet information for network control. The information may be matched against a plurality of signatures to identify and detect a known vulnerability in network activities. On the basis of a match, a verification report may be established. Techniques may further check whether a verification report is applicable to a process associated with a network packet and allow or block the process running on the host based in the report.