CVE-2021-22277
📋 TL;DR
This CVE describes an improper input validation vulnerability in multiple ABB industrial control system products. An attacker can send specially crafted input to cause denial of service, potentially disrupting industrial operations. Organizations using ABB 800xA, AC 800M, Control Builder Safe, Compact Product Suite, or SoftControl are affected.
💻 Affected Systems
- ABB 800xA
- Control Software for AC 800M
- Control Builder Safe
- Compact Product Suite - Control and I/O
- ABB Base Software for SoftControl
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete disruption of industrial control systems leading to production shutdown, safety system impairment, or process instability in critical infrastructure.
Likely Case
Temporary denial of service affecting specific controllers or workstations, requiring manual restart and causing production delays.
If Mitigated
Limited impact to non-critical systems with proper network segmentation and monitoring in place.
🎯 Exploit Status
The vulnerability involves improper input validation, which typically requires sending malformed data to vulnerable endpoints. No public exploit code has been identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: See vendor advisory for specific patched versions
Vendor Advisory: https://search.abb.com/library/Download.aspx?DocumentID=7PAA001499&LanguageCode=en&DocumentPartId=&Action=Launch
Restart Required: Yes
Instructions:
1. Review ABB advisory 7PAA001499. 2. Identify affected systems and versions. 3. Apply vendor-provided patches. 4. Restart affected systems. 5. Test functionality post-patch.
🔧 Temporary Workarounds
Network Segmentation
allIsolate ABB control systems from untrusted networks using firewalls and network segmentation
Input Validation Rules
allImplement network-level input validation using industrial firewalls or intrusion prevention systems
🧯 If You Can't Patch
- Implement strict network segmentation to isolate ABB systems from potential attack vectors
- Deploy industrial intrusion detection systems to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check system version against ABB advisory 7PAA001499. Review system logs for unexpected input validation errors.Check Version:
Check ABB software version through Control Builder or system management interface (vendor-specific commands vary)Verify Fix Applied:
Verify patch installation through version check and test system functionality. Monitor for continued stability.📡 Detection & Monitoring
Log Indicators:
- Unexpected input validation errors
- System crashes or restarts
- Connection attempts to control system ports
Network Indicators:
- Unusual traffic patterns to ABB control system ports
- Malformed packets targeting industrial protocols
SIEM Query:
source="ABB_Control_System" AND (event_type="crash" OR event_type="validation_error")