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Vulnerabilities

CVE-2020-37216

High
CWE-20 — Weakness Type
Published: Apr 3, 2026  ·  Modified: Apr 10, 2026  ·  Source: NVD
CVSS v3
7.5
🔗 NVD Official
📄 Description (English)

Hirschmann HiOS devices versions prior to 08.1.00 and 07.1.01 contain a denial of service vulnerability in the EtherNet/IP stack where improper handling of packet length fields allows remote attackers to crash or hang the device. Attackers can send specially crafted UDP EtherNet/IP packets with a length value larger than the actual packet size to render the device inoperable.

🤖 AI Executive Summary

Hirschmann HiOS devices prior to versions 08.1.00 and 07.1.01 contain a critical denial of service vulnerability in the EtherNet/IP stack caused by improper packet length validation. Remote attackers can send specially crafted UDP packets to crash or hang affected devices, potentially disrupting industrial control systems and critical infrastructure. This vulnerability poses significant risk to Saudi organizations operating industrial networks, particularly in energy, water, and manufacturing sectors.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 1, 2026 08:55
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability directly impacts Saudi critical infrastructure operators, particularly: (1) ARAMCO and energy sector facilities using Hirschmann industrial switches and controllers in SCADA/ICS environments; (2) Saudi Water Authority (SWCC) water treatment and distribution systems; (3) Manufacturing and petrochemical facilities; (4) Telecommunications infrastructure (STC, Mobily) using industrial networking equipment. The DoS nature allows attackers to disrupt operations without authentication, potentially causing extended downtime in critical services. Saudi organizations relying on EtherNet/IP for industrial automation face operational continuity risks.
🏢 Affected Saudi Sectors
Energy (ARAMCO, power generation) Water and Wastewater (SWCC) Manufacturing and Petrochemicals Telecommunications (STC, Mobily) Government Critical Infrastructure Healthcare (medical device networks) Transportation and Logistics
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Identify all Hirschmann HiOS devices in your network using network discovery tools and asset management systems
2. Document device versions and create inventory of affected systems (versions prior to 08.1.00 and 07.1.01)
3. Isolate affected devices from untrusted networks where possible
4. Implement network segmentation to restrict EtherNet/IP traffic to authorized sources only

Patching Guidance:
1. Upgrade Hirschmann HiOS devices to version 08.1.00 or 07.1.01 or later immediately
2. Test patches in non-production environments first
3. Schedule maintenance windows for production system upgrades
4. Verify firmware integrity using manufacturer-provided checksums

Compensating Controls (if patching delayed):
1. Deploy network-based access controls (ACLs) to restrict UDP EtherNet/IP traffic (port 2222) to known legitimate sources
2. Implement rate limiting on EtherNet/IP traffic to mitigate DoS impact
3. Monitor for suspicious packet patterns with oversized length fields
4. Deploy IDS/IPS rules to detect malformed EtherNet/IP packets

Detection Rules:
1. Monitor for UDP packets on port 2222 with length field values exceeding actual packet size
2. Alert on repeated connection attempts to EtherNet/IP devices from external sources
3. Track device availability and uptime anomalies
4. Log all firmware update activities and version changes
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع أجهزة Hirschmann HiOS في شبكتك باستخدام أدوات اكتشاف الشبكة وأنظمة إدارة الأصول
2. توثيق إصدارات الأجهزة وإنشاء جرد للأنظمة المتأثرة (الإصدارات السابقة لـ 08.1.00 و 07.1.01)
3. عزل الأجهزة المتأثرة عن الشبكات غير الموثوقة حيث أمكن
4. تنفيذ تقسيم الشبكة لتقييد حركة EtherNet/IP للمصادر المصرح بها فقط

إرشادات التصحيح:
1. ترقية أجهزة Hirschmann HiOS إلى الإصدار 08.1.00 أو 07.1.01 أو أحدث فوراً
2. اختبار التصحيحات في بيئات غير الإنتاج أولاً
3. جدولة نوافذ الصيانة لترقيات الأنظمة الإنتاجية
4. التحقق من سلامة البرنامج الثابت باستخدام المجاميع الاختيارية المقدمة من الشركة المصنعة

الضوابط البديلة (إذا تأخر التصحيح):
1. نشر عناصر التحكم في الوصول المستندة إلى الشبكة (ACLs) لتقييد حركة EtherNet/IP (المنفذ 2222) للمصادر الشرعية المعروفة
2. تنفيذ تحديد معدل حركة EtherNet/IP للتخفيف من تأثير DoS
3. مراقبة أنماط الحزم المريبة ذات حقول الطول الزائدة
4. نشر قواعد IDS/IPS للكشف عن حزم EtherNet/IP المشوهة

قواعد الكشف:
1. مراقبة حزم UDP على المنفذ 2222 بقيم حقول الطول التي تتجاوز حجم الحزمة الفعلي
2. التنبيه على محاولات الاتصال المتكررة بأجهزة EtherNet/IP من مصادر خارجية
3. تتبع شذوذ توفر الأجهزة وأوقات التشغيل
4. تسجيل جميع أنشطة تحديث البرنامج الثابت وتغييرات الإصدار
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.12.6.1 - Management of technical vulnerabilities ECC 2024 A.12.2.1 - Change management procedures ECC 2024 A.13.1.3 - Segregation of networks ECC 2024 A.14.2.1 - Secure development policy
🔵 SAMA CSF
SAMA CSF ID.RA-1 - Asset management and vulnerability identification SAMA CSF PR.IP-12 - Secure software development practices SAMA CSF DE.CM-1 - Detection and monitoring of anomalies SAMA CSF RS.MI-1 - Incident response and mitigation
🟡 ISO 27001:2022
ISO 27001:2022 A.12.3.1 - Segregation of networks ISO 27001:2022 A.12.6.1 - Management of technical vulnerabilities ISO 27001:2022 A.14.2.1 - Secure development policy ISO 27001:2022 A.8.1.1 - Inventory of assets
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Security patches and updates PCI DSS 11.2 - Vulnerability scanning
📊 CVSS Score
7.5
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityN — None / Network
IntegrityN — None / Network
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score7.5
CWECWE-20
EPSS0.02%
Exploit No
Patch ✗ No
Published 2026-04-03
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
8.2
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
CWE-20
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