Detailed attack pattern
Stable
CAPEC-326: TCP Initial Window Size Probe
This OS fingerprinting probe checks the initial TCP Window size. TCP stacks limit the range of sequence numbers allowable within a session to maintain the "connected" state within TCP protocol logic. The initial window size specifies a range of acceptable sequence numbers that will qualify as a response to an ACK packet within a session. Various operating systems use different Initial window sizes. The initial window size can be sampled by establishing an ordinary TCP connection.
Low
Typical severity
Per MITRE
Medium
Likelihood of attack
Per MITRE
1
Related weaknesses
CWEs this targets
Detailed
Abstraction
MITRE classification
Overview
CAPEC-326 (TCP Initial Window Size Probe) is a detailed-level attack pattern catalogued by MITRE in the Common Attack Pattern Enumeration and Classification (CAPEC). It describes a recurring method attackers use to exploit software weaknesses.