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Vulnerabilities

CVE-2016-20039

High
Multi Emulator Super System 0.154-3.1 contains a buffer overflow vulnerability in the gamma parameter handling that allows local attackers to crash the application or execute arbitrary code. Attackers
CWE-787 — Weakness Type
Published: Mar 28, 2026  ·  Modified: Apr 4, 2026  ·  Source: NVD
CVSS v3
8.4
🔗 NVD Official
📄 Description (English)

Multi Emulator Super System 0.154-3.1 contains a buffer overflow vulnerability in the gamma parameter handling that allows local attackers to crash the application or execute arbitrary code. Attackers can supply an oversized gamma parameter value to overflow the stack buffer and overwrite the instruction pointer with a controlled address to achieve code execution.

🤖 AI Executive Summary

CVE-2016-20039 is a stack buffer overflow vulnerability in Multi Emulator Super System (MESS) versions 0.154-3.1 affecting gamma parameter handling. While no public exploits are currently available and the vulnerability requires local access, the high CVSS score of 8.4 indicates potential for arbitrary code execution. The lack of available patches presents a significant risk for organizations still running affected versions.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 24, 2026 04:52
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability has limited direct impact on critical Saudi sectors as MESS is primarily a retro gaming emulator with minimal enterprise deployment. However, government research institutions, universities, and cybersecurity labs in Saudi Arabia that use MESS for security research or legacy system testing could be affected. The vulnerability poses a risk in environments where untrusted users have local system access, particularly in shared computing environments at ARAMCO research divisions, KACST facilities, or academic institutions. The lack of patches makes this a persistent risk for any organization unable to migrate away from affected versions.
🏢 Affected Saudi Sectors
Research & Development Higher Education Government Research Institutions Cybersecurity Labs
⚖️ Saudi Risk Score (AI)
4.2
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Identify all systems running MESS versions 0.154-3.1 within your organization
2. Restrict local access to systems running affected versions to trusted users only
3. Implement principle of least privilege for user accounts
4. Disable or isolate MESS installations if not critical to operations

Patching Guidance:
1. Upgrade to MESS version 3.2 or later if available from official sources
2. If upgrade is not feasible, consider migrating to alternative emulation software (MAME, RetroArch) that may have security updates
3. Monitor official MESS repositories for security patches

Compensating Controls:
1. Implement application whitelisting to restrict MESS execution
2. Use mandatory access controls (SELinux/AppArmor) to restrict MESS process capabilities
3. Monitor system calls for suspicious buffer overflow patterns
4. Implement stack canaries and ASLR at OS level
5. Restrict gamma parameter input validation at application wrapper level

Detection Rules:
1. Monitor for MESS process crashes with segmentation faults
2. Alert on attempts to pass oversized gamma parameter values (>1024 bytes)
3. Monitor for unexpected code execution following MESS parameter input
4. Track unauthorized modifications to instruction pointers in MESS processes
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع الأنظمة التي تقوم بتشغيل إصدارات MESS 0.154-3.1 داخل مؤسستك
2. تقييد الوصول المحلي إلى الأنظمة التي تقوم بتشغيل الإصدارات المتأثرة للمستخدمين الموثوقين فقط
3. تطبيق مبدأ أقل امتياز لحسابات المستخدمين
4. تعطيل أو عزل تثبيتات MESS إذا لم تكن حرجة للعمليات

إرشادات التصحيح:
1. الترقية إلى إصدار MESS 3.2 أو أحدث إن توفر من المصادر الرسمية
2. إذا لم يكن الترقية ممكنة، فكر في الهجرة إلى برامج محاكاة بديلة (MAME، RetroArch) قد تحتوي على تحديثات أمان
3. مراقبة مستودعات MESS الرسمية للحصول على تصحيحات أمان

الضوابط التعويضية:
1. تطبيق قائمة بيضاء للتطبيقات لتقييد تنفيذ MESS
2. استخدام الضوابط الإلزامية للوصول (SELinux/AppArmor) لتقييد قدرات عملية MESS
3. مراقبة استدعاءات النظام للأنماط المريبة لتجاوز المخزن المؤقت
4. تطبيق stack canaries و ASLR على مستوى نظام التشغيل
5. تقييد التحقق من صحة معامل جاما على مستوى غلاف التطبيق

قواعد الكشف:
1. مراقبة أعطال عملية MESS مع أخطاء التجزئة
2. تنبيه محاولات تمرير قيم معامل جاما كبيرة الحجم (>1024 بايت)
3. مراقبة تنفيذ الكود غير المتوقع بعد إدخال معامل MESS
4. تتبع التعديلات غير المصرح بها على مؤشرات التعليمات في عمليات MESS
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.12.2.1 - Change management procedures A.12.6.1 - Management of technical vulnerabilities A.14.2.1 - Secure development policy A.12.3.1 - Segregation of development, test and production environments
🔵 SAMA CSF
ID.RA-1 - Asset management and vulnerability identification PR.IP-12 - Software, firmware, and information integrity mechanisms DE.CM-8 - Vulnerability scans are performed
🟡 ISO 27001:2022
A.12.2.1 - Change management A.12.6.1 - Management of technical vulnerabilities A.14.2.1 - Secure development policy A.14.2.5 - Secure development environment
📊 CVSS Score
8.4
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack VectorL — Low / Local
Attack ComplexityL — Low / Local
Privileges RequiredN — None / Network
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityH — High
IntegrityH — High
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score8.4
CWECWE-787
EPSS0.02%
Exploit No
Patch ✗ No
Published 2026-03-28
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
4.2
/ 10.0 — Saudi Risk
Priority: MEDIUM
🏷️ Tags
CWE-787
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