Understanding BGP Hijacking: Threats and Prevention

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Understanding BGP Hijacking: The Threat and How to Prevent It

In today’s interconnected world, the integrity of internet routing is crucial. However, incidents like BGP hijacking pose significant threats to this integrity. Recently, a notable incident involving Cloudflare brought this issue into the spotlight. This blog post will delve into BGP hijacking, its impact, and how organizations can protect themselves from such threats.

What is BGP Hijacking?

BGP (Border Gateway Protocol) is the protocol that makes the internet work. It determines how packets of data are routed between autonomous systems (AS), which are large networks or groups of networks under a common administration. BGP hijacking occurs when a malicious actor takes control of IP address prefixes by corrupting the BGP routing table, effectively redirecting internet traffic to a different destination.

Case Study: Cloudflare’s Incident

On June 27, 2024, Cloudflare’s DNS resolver service experienced an outage due to a BGP hijacking incident. Attackers announced routes for the IP address space from various networks, redirecting traffic meant for Cloudflare’s DNS service to their servers. This disruption caused significant DNS resolution issues globally, highlighting the impact BGP hijacking can have on internet services.

Impact of BGP Hijacking

The consequences of BGP hijacking are severe and far-reaching. Here are some potential impacts:

  • Data Interception: Attackers can intercept sensitive data, including emails and financial transactions.
  • Service Disruption: As seen in the Cloudflare incident, critical services can be disrupted, causing widespread outages.
  • Financial Loss: Companies may face significant financial losses due to downtime and remediation efforts.
  • Reputation Damage: Trust in affected organizations can be severely damaged, leading to long-term reputational harm.

Preventing BGP Hijacking

Preventing BGP hijacking requires a combination of technical measures and best practices:

Route Filtering

Implementing strict route filtering can prevent incorrect routes from being accepted. Organizations should filter BGP announcements to only accept routes from known and trusted sources.

RPKI (Resource Public Key Infrastructure)

RPKI is a security framework that uses cryptographic certificates to verify the authenticity of BGP route announcements. By implementing RPKI, networks can reject invalid routes, reducing the risk of hijacking.

Monitoring and Detection

Continuous monitoring of BGP routes is essential. Tools like BGPMon and BGPStream can help detect suspicious changes in BGP routing and alert network administrators to potential hijacking attempts.

Collaboration and Information Sharing

Industry collaboration and information sharing are vital. Organizations should participate in network operator groups and threat intelligence sharing communities to stay informed about potential threats and mitigation strategies.

Fusion Computing’s Managed Security Services

At Fusion Computing, we understand the critical importance of securing your network infrastructure. Our Managed Cybersecurity services include:

  • Continuous Monitoring: Our team provides 24/7 monitoring to detect and respond to threats in real-time.
  • Advanced Threat Detection: Using industry-leading tools, we identify and mitigate advanced threats, including BGP hijacking attempts.
  • Security Audits: Regular security audits to ensure compliance with best practices and identify vulnerabilities.
  • Employee Training: Security awareness training to help employees recognize and respond to cyber threats.


BGP hijacking is a significant threat that can have devastating consequences. However, by implementing robust security measures and working with experienced cybersecurity providers like Fusion Computing, organizations can protect their network infrastructure from such attacks. If you’re ready to enhance your network security and protect against threats like BGP hijacking, contact us today to learn more about our managed cybersecurity services.