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Vulnerabilities

CVE-2016-4523

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Trihedral VTScada (formerly VTS) Denial-of-Service Vulnerability — The WAP interface in Trihedral VTScada (formerly VTS) allows remote attackers to cause a denial-of-service (DoS).
Published: Apr 15, 2022  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Trihedral VTScada (formerly VTS) Denial-of-Service Vulnerability — The WAP interface in Trihedral VTScada (formerly VTS) allows remote attackers to cause a denial-of-service (DoS).

🤖 AI Executive Summary

CVE-2016-4523 is a critical denial-of-service vulnerability in Trihedral VTScada (formerly VTS) SCADA/HMI software, specifically in its WAP interface. Remote attackers can exploit this vulnerability to cause a denial of service, disrupting industrial control system operations. With a CVSS score of 9.0 and a publicly available exploit, this vulnerability poses an immediate threat to any organization running VTScada for industrial process monitoring and control. Although the vulnerability dates to 2016, unpatched legacy SCADA systems remain common in critical infrastructure environments.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 5, 2026 21:15
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability directly impacts Saudi critical infrastructure sectors that rely on SCADA/HMI systems. The energy sector (ARAMCO, SABIC, SEC) is at highest risk as VTScada is used in oil & gas, petrochemical, and power generation facilities. Water and wastewater utilities (NWC, SWCC) using VTScada for process control are also vulnerable. A successful DoS attack could disrupt industrial processes, potentially causing safety incidents or production outages. Given Saudi Arabia's Vision 2030 smart infrastructure initiatives and the increasing connectivity of OT systems, unpatched SCADA vulnerabilities represent a significant national security concern. Government entities managing critical infrastructure under NCA oversight should treat this as high priority.
🏢 Affected Saudi Sectors
Energy Oil & Gas Water & Utilities Government Manufacturing Petrochemical
⚖️ Saudi Risk Score (AI)
8.5
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Identify all Trihedral VTScada installations across your OT/ICS environment
2. Apply the vendor-provided patch immediately from Trihedral's official update channels
3. If patching is not immediately possible, disable or restrict access to the WAP interface

Network Controls:
4. Ensure VTScada systems are not directly accessible from the internet
5. Implement network segmentation between IT and OT networks per IEC 62443 standards
6. Deploy industrial firewalls/DMZ between corporate and SCADA networks
7. Restrict WAP interface access to authorized IP addresses only using firewall rules

Detection:
8. Monitor for unusual traffic patterns targeting the WAP interface
9. Implement IDS/IPS rules to detect DoS attempts against VTScada services
10. Configure SIEM alerts for VTScada service availability anomalies
11. Deploy network anomaly detection on OT network segments

Long-term:
12. Establish a regular SCADA/ICS patching program
13. Conduct periodic vulnerability assessments of all OT systems
14. Review and update incident response plans for OT/SCADA DoS scenarios
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع تثبيتات VTScada من Trihedral في بيئة التقنية التشغيلية/أنظمة التحكم الصناعي
2. تطبيق التحديث الأمني المقدم من المورد فوراً من قنوات التحديث الرسمية لشركة Trihedral
3. في حال عدم إمكانية التحديث فوراً، تعطيل أو تقييد الوصول إلى واجهة WAP

ضوابط الشبكة:
4. التأكد من عدم إمكانية الوصول المباشر لأنظمة VTScada من الإنترنت
5. تطبيق تجزئة الشبكة بين شبكات تقنية المعلومات والتقنية التشغيلية وفقاً لمعايير IEC 62443
6. نشر جدران حماية صناعية/منطقة منزوعة السلاح بين الشبكات المؤسسية وشبكات SCADA
7. تقييد الوصول إلى واجهة WAP للعناوين المصرح بها فقط باستخدام قواعد جدار الحماية

الكشف والمراقبة:
8. مراقبة أنماط حركة المرور غير العادية التي تستهدف واجهة WAP
9. تطبيق قواعد IDS/IPS للكشف عن محاولات حجب الخدمة ضد خدمات VTScada
10. تكوين تنبيهات SIEM لمراقبة توفر خدمات VTScada
11. نشر كشف الشذوذ الشبكي على قطاعات شبكة التقنية التشغيلية

على المدى الطويل:
12. إنشاء برنامج منتظم لتحديث أنظمة SCADA/ICS
13. إجراء تقييمات دورية للثغرات لجميع أنظمة التقنية التشغيلية
14. مراجعة وتحديث خطط الاستجابة للحوادث لسيناريوهات حجب الخدمة في بيئات التقنية التشغيلية
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2-3-1 (Network Security) ECC 2-5-1 (Industrial Control Systems Security) ECC 2-2-1 (Vulnerability Management) ECC 2-9-1 (Cybersecurity Resilience)
🔵 SAMA CSF
3.3 (Vulnerability Management) 3.4 (Network Security) 3.7 (Cybersecurity Operations and Monitoring) 3.1 (Cybersecurity Risk Management)
🟡 ISO 27001:2022
A.8.8 (Management of technical vulnerabilities) A.8.20 (Networks security) A.8.22 (Segregation of networks) A.8.16 (Monitoring activities)
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Trihedral:VTScada (formerly VTS)
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS66.95%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2022-05-06
Published 2022-04-15
Source Feed cisa_kev
Views 1
🇸🇦 Saudi Risk Score
8.5
/ 10.0 — Saudi Risk
🏷️ Tags
kev actively-exploited
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