CVE-2021-32959
📋 TL;DR
This vulnerability is a heap-based buffer overflow in the SuiteLink server when processing commands 0x05/0x06. It allows remote attackers to execute arbitrary code or cause denial-of-service conditions. Organizations using affected AVEVA products with SuiteLink servers are impacted.
💻 Affected Systems
- AVEVA System Platform
- AVEVA InTouch
- AVEVA Historian
- Other AVEVA products using SuiteLink server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Denial-of-service causing SuiteLink server crashes and industrial process disruption.
If Mitigated
Limited impact if network segmentation and access controls prevent exploitation attempts.
🎯 Exploit Status
Buffer overflow vulnerabilities in industrial protocols are frequently weaponized. No authentication required for exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Varies by product - see AVEVA Security Bulletin AVEVA-2021-003 for specific versions
Vendor Advisory: https://www.aveva.com/content/dam/aveva/documents/support/cyber-security-updates/SecurityBulletin_AVEVA-2021-003.pdf
Restart Required: Yes
Instructions:
1. Download appropriate patch from AVEVA support portal. 2. Apply patch according to vendor instructions. 3. Restart affected services/systems. 4. Verify patch installation.
🔧 Temporary Workarounds
Network Segmentation
allIsolate SuiteLink servers from untrusted networks using firewalls.
Disable SuiteLink Server
windowsDisable SuiteLink server if not required for operations.
🧯 If You Can't Patch
- Implement strict network access controls to limit SuiteLink server exposure
- Deploy intrusion detection/prevention systems to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check installed AVEVA product versions against affected versions in vendor advisory. Verify SuiteLink server is running and accessible.Check Version:
Check product-specific version information in AVEVA application or Windows Programs and FeaturesVerify Fix Applied:
Confirm patch installation via version check and verify SuiteLink server no longer vulnerable to test payloads.📡 Detection & Monitoring
Log Indicators:
- SuiteLink server crash logs
- Unexpected process termination
- Memory access violation errors
Network Indicators:
- Unusual traffic to SuiteLink port (typically 1211/TCP)
- Malformed SuiteLink protocol packets
SIEM Query:
source="*suite*" AND (event_type="crash" OR error="buffer overflow" OR error="access violation")