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Deep Dive into SSDP Attack (Simple Service Discovery Protocol Attack)

Sunday, 3 May 2026 Add Comment Edit
SSDP Attack Infographic

Infographic: SSDP Attack explained — workflow, risks, defenses, and real-world examples.

Deep Dive into SSDP Attack (Simple Service Discovery Protocol Attack)

An SSDP attack is a type of Distributed Denial of Service (DDoS) attack that takes advantage of misconfigured SSDP-enabled devices to amplify traffic and flood a target system. This results in service disruptions, slowdowns, or complete outages.

1. What is SSDP (Simple Service Discovery Protocol)?

SSDP is a network protocol used in local networks to enable devices to discover and communicate with each other. It operates over UDP (User Datagram Protocol) on port 1900.

  • Purpose: Used in Universal Plug and Play (UPnP) devices like cameras, smart TVs, printers, routers, and IoT devices.
  • How It Works: Devices broadcast SSDP messages to identify available services on the network.
  • Risk: Poorly configured SSDP devices can be exploited in DDoS attacks.

2. How an SSDP Attack Works

  1. Network Scanning: Attackers scan for devices that support SSDP (e.g., IoT devices, printers, cameras).
  2. IP Spoofing: The attacker spoofs the victim’s IP address to make it appear as if they are the one requesting information.
  3. UDP Reflection: The attacker sends UDP discovery requests (small packets) to multiple SSDP-enabled devices. Since UDP is connectionless, devices respond without verification.
  4. Traffic Amplification: Each device sends large amounts of data (response packets) to the victim’s IP, multiplying traffic volume and overwhelming the target system.
  5. Server Overload & DDoS Impact: The victim’s bandwidth and computing resources get exhausted, causing slowdowns or crashes.

3. Why SSDP Attacks Are Dangerous

  • High Amplification Factor: A small request can trigger a large response (up to 30× amplification).
  • Hard to Trace: Attackers hide behind compromised devices, making it difficult to identify them.
  • IoT Device Vulnerabilities: Many IoT and home network devices lack security measures, making them easy targets.
  • Can Be Combined with Other Attacks: Often used with botnets (e.g., Mirai botnet) to launch massive-scale DDoS attacks.

4. Mitigation & Defense Strategies

  • ✅ Disable SSDP/UPnP on Devices: Turn off UPnP on routers, cameras, and smart devices.
  • ✅ Firewall & Network Security Rules: Block UDP traffic on port 1900 if SSDP is not required.
  • ✅ Intrusion Detection & Rate Limiting: Deploy IDS tools to monitor unusual UDP traffic and rate-limit SSDP responses.
  • ✅ Regularly Update Firmware: Keep IoT devices, routers, and printers updated with the latest security patches.
  • ✅ Use DDoS Protection Services: Cloud-based services like Cloudflare, AWS Shield, and Akamai help filter and absorb attacks.

5. Real-World SSDP Attacks

  • 🔴 2018 SSDP DDoS Attack: Cybercriminals exploited SSDP amplification to launch 1.35 Tbps DDoS attacks against GitHub.
  • 🔴 2016 Mirai Botnet Attack: The Mirai botnet hijacked thousands of IoT devices to launch SSDP-based attacks, taking down major websites like Twitter, Netflix, and Reddit.

6. Detecting SSDP Attacks Using Network Monitoring Tools

Detecting SSDP-based DDoS attacks requires a combination of network monitoring, log analysis, and intrusion detection systems (IDS). Below is a technical breakdown of how you can identify, analyze, and mitigate an SSDP attack.

Key Indicators of an SSDP Attack

  • 🔴 Unusual High UDP Traffic on Port 1900
  • 🔴 Sudden Network Slowdowns or Downtime
  • 🔴 Unresponsive or Overloaded Web Services
  • 🔴 Increased SSDP Responses from Unexpected Devices
  • 🔴 Spoofed IP Requests Flooding the Network

Tools for Detecting SSDP Attacks

(i) Wireshark (Packet Analysis)

udp.port == 1900

Filter SSDP traffic, look for high M-SEARCH or NOTIFY requests, and analyze suspicious patterns.

(ii) NetFlow (Traffic Analysis)

ip flow-export destination <collector-IP> 9996

Monitor UDP traffic spikes and amplification patterns.

(iii) Suricata (Intrusion Detection System - IDS)

sudo apt-get install suricata
alert udp any any -> any 1900 (msg:"Possible SSDP DDoS Attack"; content:"M-SEARCH"; nocase; threshold:type both, track by_src, count 10, seconds 1; sid:100001;)
sudo suricata -c /etc/suricata/suricata.yaml -i eth0
tail -f /var/log/suricata/fast.log

(iv) Snort (Network Intrusion Detection)

sudo apt-get install snort
alert udp any any -> any 1900 (msg:"SSDP Reflection Attack Detected"; flow:to_server; content:"M-SEARCH"; nocase; sid:200001;)
sudo snort -A console -c /etc/snort/snort.conf -i eth0

7. Responding to an SSDP Attack

  • ✅ Block UDP port 1900 on your firewall.
  • ✅ Rate-limit SSDP responses.
  • ✅ Disable UPnP on routers and IoT devices.
  • ✅ Contact your ISP for mitigation support.
  • ✅ Use DDoS protection services.

8. Preventing Future SSDP Attacks

  • 🔹 Keep devices updated with the latest firmware patches.
  • 🔹 Regularly scan your network for open UDP ports.
  • 🔹 Use an Intrusion Detection System (IDS) like Suricata or Snort.
  • 🔹 Limit network exposure by blocking unused ports and disabling UPnP.
  • 🔹 Educate employees and network users about cybersecurity best practices.


SSDP attacks are dangerous amplification DDoS attacks that exploit misconfigured IoT devices. By using network monitoring tools like Wireshark, NetFlow, Suricata, and Snort, you can detect and mitigate these threats effectively.

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