Two Common Router Security Threats

Intrusion DetectionTCP Congestion ControlInstalling Wireshark on Mac OS X (Yosemite)What are Rogue Access Points?Two Common Router Security ThreatsModern Application...

· 1 min read >
router security threats

Syn Flood or Denial of Service Attack

Syn Flood attacks, often referred to as Denial of Service Attacks are caused through exploitation of the TCP protocol. The attacker sends a large number of TCP/SYN packets using a forged address. Because of this, the destination server is unable to successfully establish a proper connection due to the source being unreachable. Lawrence (n.d.). Each time the server attempts to establish a connection, resources are used up with the flooding of packets causing eventual slow down or non-responsiveness.

There are different methods that can be used to mitigate these types of attacks. One common mitigation strategy is called blackholing, where the service provider diverts all traffic into a ‘black hole’ in an effort to save resources. Cisco (2014). The problem with this strategy is that legitimate packets are also lost in the process. Access Control Lists is another method to control incoming traffic as well as firewalls. In their paper, Ioannidis & Bellovin (2002) discussed the implementation of Pushback, a process where functionality is added to each router to detect and preferentially drop packets that ‘probably’ belong to an attack.

Brute Force

Brute force attacks can occur when routers are subjected to an attacker attempting to guess the password and gain unauthorized access. These types of attacks can be used in conjunction with automated guessing tools and dictionary methods in order to attempt to crack the password.

There are several methods for defending against brute force attacks. Lockouts can be used to prevent too many password retries. Drawbacks of lockouts however include potential denial of service, diversion tactics by the attackers, and overall inefficiency. Better ways to deal with these types of attacks include injecting random pauses between retries, sending success HTTP 200 success codes to confuse the attacker instead of the typical 401, and better use of security or secret questions. System Administration Database (2007).


System Administration Database. (2007) Blocking Brute Force Attacks. Retrieved from:

Lawrence, M. (n.d.) Types of Attacks on Routers. Studio D. Retreived from:

Cisco (2014). Defeating DDOS Attacks. Retrieved from:

Ioannidis, J., & Bellovin, S. M., (2002). Implementing Pushback: Router-Based Defense Against DDoS Attacks. Retrieved from

Series Navigation<< What are Rogue Access Points?Modern Application Frameworks, Legacy Browsers and Security Implications >>

Written by Ian Carnaghan
I am a software developer and online educator who likes to keep up with all the latest in technology. I also manage cloud infrastructure, continuous monitoring, DevOps processes, security, and continuous integration and deployment. In my spare time I teach undergraduate classes in web development. Profile
SSL Labs Rating Woes

SSL Labs Rating Woes

Ian Carnaghan in Coding, Cybersecurity
  ·   1 min read

Leave a Reply

1 Comment threads
0 Thread replies
Most reacted comment
Hottest comment thread
1 Comment authors
canon printer offline windows 10 Recent comment authors
newest oldest most voted
Notify of
canon printer offline windows 10

There are many security risks in a router which will lead to a great problem for the users. You must always protect your router with WPA 2 connection so that it becomes impossible for hacking.