CVE-2025-2521
📋 TL;DR
This CVE describes a memory buffer vulnerability in Honeywell Experion PKS and OneWireless WDM's Control Data Access component. An attacker could exploit this to execute arbitrary code remotely on affected industrial control systems. Organizations using Honeywell Experion PKS C300, FIM, UOC, CN100, HCA, C300PM, C200E products or OneWireless WDM systems are affected.
💻 Affected Systems
- C300 PCNT02
- C300 PCNT05
- FIM4
- FIM8
- UOC
- CN100
- HCA
- C300PM
- C200E
- OneWireless WDM
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution allowing full system compromise, potential disruption of industrial processes, and unauthorized access to control systems.
Likely Case
System instability, denial of service, or limited information disclosure through buffer overread.
If Mitigated
Limited impact if systems are isolated, patched, or have additional security controls in place.
🎯 Exploit Status
Vulnerability involves improper index validation leading to buffer overread, which could be leveraged for RCE. No public exploit code known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Experion PKS: 520.2 TCU9 HF1 or 530.1 TCU3 HF1; OneWireless WDM: 322.5 or 331.1
Vendor Advisory: https://process.honeywell.com/
Restart Required: Yes
Instructions:
1. Download appropriate patch from Honeywell support portal. 2. Backup system configuration. 3. Apply patch following Honeywell documentation. 4. Restart affected systems. 5. Verify patch installation.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected systems from untrusted networks and implement strict firewall rules.
Access Control Restrictions
allLimit network access to Control Data Access component to authorized systems only.
🧯 If You Can't Patch
- Implement strict network segmentation and isolate affected systems
- Deploy intrusion detection systems and monitor for anomalous network traffic
🔍 How to Verify
Check if Vulnerable:
Check system version against affected ranges in Honeywell documentation or system configuration.Check Version:
Check via Honeywell system administration interface or consult system documentation for version query commands.Verify Fix Applied:
Verify system version matches patched versions: 520.2 TCU9 HF1, 530.1 TCU3 HF1, 322.5, or 331.1.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation, memory access violations, or unexpected system restarts
Network Indicators:
- Anomalous traffic to Control Data Access ports, unexpected network connections
SIEM Query:
source_ip IN (external_ips) AND dest_port IN (cdaports) AND protocol=tcp AND bytes_transferred > threshold