TCP Hijacking

    <span class="glossary-tooltip glossary-term-10104"><span class="glossary-link"><a href="https://skycentral.co.uk/glossary/tcp-hijacking/">TCP Hijacking</a></span><span class="hidden glossary-tooltip-content clearfix"><span class="glossary-tooltip-text"><br /> <br /> <br /> TCP Hijacking: Understanding the Threat...</span></span></span>: Understanding the Threat and How to Prevent It

    The Threat of TCP Hijacking

    Understanding TCP Hijacking

    TCP hijacking, also known as TCP session hijacking, is a cybersecurity attack that involves an unauthorized party intercepting and manipulating a TCP session between two parties. This can lead to data theft, unauthorized access, and other security breaches.

    How TCP Hijacking Works

    TCP hijacking typically occurs in four main stages:

    1. Initial Session Establishment
    2. Sequence Number Prediction
    3. Session Takeover
    4. Data Manipulation

    Initial Session Establishment

    During the initial TCP handshake, the attacker observes the sequence and acknowledgment numbers exchanged between the client and server to identify the current session.

    Sequence Number Prediction

    The attacker predicts the next sequence number in the TCP session to insert forged packets and gain control of the session.

    Session Takeover

    Once the attacker successfully predicts the sequence number, they inject their own packets into the session, effectively taking control of the communication.

    Data Manipulation

    With control of the TCP session, the attacker can intercept, modify, or inject data, potentially leading to serious security and privacy implications.

    Preventing TCP Hijacking

    To mitigate the risk of TCP hijacking, organizations can implement several security measures, including:

    • Using strong encryption and authentication protocols
    • Implementing intrusion detection and prevention systems
    • Regularly updating and patching network infrastructure and systems
    • Monitoring network traffic for unusual activity


    TCP hijacking poses a significant threat to network security, but with proper precautions and vigilance, organizations can reduce the risk of falling victim to this type of attack.