CVE-2021-38487
📋 TL;DR
This vulnerability in RTI Connext Professional and Micro allows attackers to send specially crafted packets that flood target devices with unwanted traffic, causing denial-of-service conditions and potential information exposure. It affects industrial control systems and IoT devices using vulnerable RTI middleware versions.
💻 Affected Systems
- RTI Connext Professional
- RTI Connext Micro
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Critical systems become unavailable, sensitive operational data is exposed, and cascading failures affect dependent systems in industrial environments.
Likely Case
Targeted devices experience service degradation or complete denial-of-service, disrupting operations in industrial control or IoT deployments.
If Mitigated
Limited impact with proper network segmentation and traffic filtering, potentially causing temporary performance issues but no data exposure.
🎯 Exploit Status
Exploitation requires only network access to vulnerable devices and ability to send crafted packets. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Connext Professional 6.1.1 and later; Connext Micro 3.0.3 and later
Vendor Advisory: https://www.rti.com/vulnerabilities/#cve-2021-38487
Restart Required: Yes
Instructions:
1. Download patched version from RTI support portal. 2. Backup current configuration. 3. Install update following vendor documentation. 4. Restart affected services. 5. Verify functionality.
🔧 Temporary Workarounds
Network Segmentation
allIsolate vulnerable devices in protected network segments with strict firewall rules
Traffic Filtering
linuxImplement network filtering to block suspicious packet patterns targeting RTI ports
iptables -A INPUT -p udp --dport 7400:7500 -m string --algo bm --hex-string '|01 00 00 00|' -j DROP
🧯 If You Can't Patch
- Implement strict network access controls to limit which systems can communicate with vulnerable devices
- Deploy intrusion detection systems to monitor for packet flooding patterns and alert on suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check RTI version using vendor tools or system package manager. Vulnerable if: Connext Professional 4.1-6.1.0 or Connext Micro ≥2.4Check Version:
rtiddsgen -version (for Connext Professional) or check application logs for version informationVerify Fix Applied:
Verify installed version is Connext Professional ≥6.1.1 or Connext Micro ≥3.0.3. Test with legitimate traffic to ensure functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual traffic spikes
- Service disruption logs
- Connection timeouts
- Resource exhaustion warnings
Network Indicators:
- High volume of small packets to RTI ports (typically 7400-7500)
- Abnormal packet patterns from single sources
- UDP flood patterns
SIEM Query:
source_ip_count > 100 AND dest_port IN (7400, 7401, 7402, 7500) AND protocol = UDP WITHIN 1 MINUTE