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Vulnerabilities

CVE-2023-33009

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Zyxel Multiple Firewalls Buffer Overflow Vulnerability — Zyxel ATP, USG FLEX, USG FLEX 50(W), USG20(W)-VPN, VPN, and ZyWALL/USG firewalls contain a buffer overflow vulnerability in the notification fu
Published: Jun 5, 2023  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Zyxel Multiple Firewalls Buffer Overflow Vulnerability — Zyxel ATP, USG FLEX, USG FLEX 50(W), USG20(W)-VPN, VPN, and ZyWALL/USG firewalls contain a buffer overflow vulnerability in the notification function that could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and remote code execution on an affected device.

🤖 AI Executive Summary

Zyxel firewalls contain a critical buffer overflow vulnerability in the notification function allowing unauthenticated remote code execution and denial-of-service attacks. Multiple firewall models including ATP, USG FLEX, and ZyWALL series are affected by this vulnerability.

📄 Description (Arabic)

تحتوي جدران حماية Zyxel المتعددة على ثغرة تجاوز مخزن مؤقت حرجة في وظيفة الإخطار تسمح للمهاجمين غير المصرح لهم بتنفيذ أكواد بعيدة وإحداث هجمات حرمان الخدمة. تؤثر الثغرة على طرز ATP و USG FLEX و USG20 و ZyWALL/USG. يتطلب الأمر تحديث فوري للبرامج الثابتة وتقييد الوصول إلى أجهزة جدار الحماية.

🤖 ملخص تنفيذي (AI)

ثغرة تجاوز المخزن المؤقت الحرجة في جدران حماية Zyxel تسمح بتنفيذ أكواد بعيدة وهجمات حرمان الخدمة دون مصادقة. تؤثر الثغرة على عدة طرز من جدران الحماية بما فيها ATP و USG FLEX و ZyWALL.

🤖 AI Intelligence Analysis Analyzed: Apr 21, 2026 12:33
🇸🇦 Saudi Arabia Impact Assessment
Saudi Relevance: high
🏢 Affected Saudi Sectors
banking telecom energy government healthcare
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
9.0
/ 10.0
🔧 Remediation Steps (English)
Immediately update affected Zyxel firewall models to the latest patched firmware versions. Disable remote access to firewall management interfaces where possible. Implement network segmentation to restrict access to firewall devices. Monitor firewall logs for suspicious notification function activity and unauthorized access attempts. Apply vendor security patches as soon as they become available.
🔧 خطوات المعالجة (العربية)
قم بتحديث طرز جدران الحماية Zyxel المتأثرة فوراً إلى أحدث إصدارات البرامج الثابتة المصححة. عطّل الوصول البعيد لواجهات إدارة جدار الحماية حيث أمكن. طبّق تقسيم الشبكة لتقييد الوصول إلى أجهزة جدار الحماية. راقب سجلات جدار الحماية للكشف عن نشاط مريب في وظيفة الإخطار ومحاولات الوصول غير المصرح بها. طبّق تصحيحات الأمان من المورد في أسرع وقت ممكن.
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
2.1 2.2 3.1 3.2
🔵 SAMA CSF
ID.BE-5 PR.DS-1 PR.DS-2 DE.CM-1
🟡 ISO 27001:2022
A.12.6.1 A.14.2.1 A.14.2.5
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Zyxel:Multiple Firewalls
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS6.17%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2023-06-26
Published 2023-06-05
Source Feed cisa_kev
Views 1
🇸🇦 Saudi Risk Score
9.0
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited
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