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Global vulnerability Multiple sectors CRITICAL 30m Global vulnerability Information Technology / Software Infrastructure CRITICAL 32m Global data_breach Healthcare CRITICAL 47m Global data_breach Mobile Technology / Consumer Electronics HIGH 1h Global ransomware Cybersecurity Services / Multiple Sectors CRITICAL 1h Global apt Cryptocurrency and Blockchain CRITICAL 1h Global malware Financial Services, Mobile Payments HIGH 2h Global vulnerability Government and Critical Infrastructure CRITICAL 5h Global apt Cryptocurrency and Blockchain CRITICAL 13h Global malware Financial Services / Cryptocurrency CRITICAL 13h Global vulnerability Multiple sectors CRITICAL 30m Global vulnerability Information Technology / Software Infrastructure CRITICAL 32m Global data_breach Healthcare CRITICAL 47m Global data_breach Mobile Technology / Consumer Electronics HIGH 1h Global ransomware Cybersecurity Services / Multiple Sectors CRITICAL 1h Global apt Cryptocurrency and Blockchain CRITICAL 1h Global malware Financial Services, Mobile Payments HIGH 2h Global vulnerability Government and Critical Infrastructure CRITICAL 5h Global apt Cryptocurrency and Blockchain CRITICAL 13h Global malware Financial Services / Cryptocurrency CRITICAL 13h Global vulnerability Multiple sectors CRITICAL 30m Global vulnerability Information Technology / Software Infrastructure CRITICAL 32m Global data_breach Healthcare CRITICAL 47m Global data_breach Mobile Technology / Consumer Electronics HIGH 1h Global ransomware Cybersecurity Services / Multiple Sectors CRITICAL 1h Global apt Cryptocurrency and Blockchain CRITICAL 1h Global malware Financial Services, Mobile Payments HIGH 2h Global vulnerability Government and Critical Infrastructure CRITICAL 5h Global apt Cryptocurrency and Blockchain CRITICAL 13h Global malware Financial Services / Cryptocurrency CRITICAL 13h
Vulnerabilities

CVE-2021-27852

Critical 🇺🇸 CISA KEV ⚡ Exploit Available
Checkbox Survey Deserialization of Untrusted Data Vulnerability — Deserialization of Untrusted Data vulnerability in CheckboxWeb.dll of Checkbox Survey allows an unauthenticated remote attacker to exe
Published: Apr 11, 2022  ·  Source: CISA_KEV
CVSS v3
9.0
🔗 NVD Official
📄 Description (English)

Checkbox Survey Deserialization of Untrusted Data Vulnerability — Deserialization of Untrusted Data vulnerability in CheckboxWeb.dll of Checkbox Survey allows an unauthenticated remote attacker to execute arbitrary code.

🤖 AI Executive Summary

CVE-2021-27852 is a critical deserialization vulnerability in Checkbox Survey affecting CheckboxWeb.dll that allows unauthenticated remote attackers to execute arbitrary code with a CVSS score of 9.0. This vulnerability poses an immediate threat to organizations using Checkbox Survey for data collection and market research. An exploit is publicly available, making this a high-priority threat requiring immediate patching.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 20, 2026 11:03
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability primarily impacts Saudi organizations in market research, banking customer surveys, telecommunications customer feedback systems, and government agencies conducting citizen surveys. Financial institutions using Checkbox Survey for customer research face direct risk of data breach and system compromise. Government entities and ARAMCO subsidiaries conducting surveys are at risk of unauthorized access to sensitive survey data and infrastructure compromise. The lack of authentication requirement makes this particularly dangerous for organizations with internet-facing Checkbox Survey instances.
🏢 Affected Saudi Sectors
Banking and Financial Services Government and Public Administration Telecommunications Energy and Oil & Gas Healthcare Market Research and Consulting Retail and E-commerce
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Checkbox Survey instances in your environment and document their network locations
2. Immediately apply the latest security patch from Checkbox for CheckboxWeb.dll
3. If patching cannot be completed immediately, isolate affected systems from internet access or place behind WAF with strict access controls

PATCHING GUIDANCE:
1. Download the latest patched version from Checkbox official website
2. Back up current Checkbox Survey configuration and databases before patching
3. Test patches in non-production environment first
4. Deploy patches during maintenance windows with rollback procedures ready
5. Verify patch installation by checking CheckboxWeb.dll version and file hash

COMPENSATING CONTROLS (if immediate patching not possible):
1. Implement network segmentation to restrict access to Checkbox Survey to authorized networks only
2. Deploy Web Application Firewall (WAF) rules to block suspicious deserialization payloads
3. Monitor for exploitation attempts using IDS/IPS signatures
4. Implement strict input validation and disable unnecessary serialization features
5. Enable detailed logging of all requests to Checkbox Survey endpoints

DETECTION RULES:
1. Monitor for POST requests to CheckboxWeb.dll endpoints with suspicious serialized object patterns
2. Alert on any execution of child processes from Checkbox Survey application pool
3. Monitor for unusual outbound connections from Checkbox Survey servers
4. Track failed and successful authentication attempts to survey endpoints
5. Monitor for modifications to CheckboxWeb.dll file integrity
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. حدد جميع مثيلات Checkbox Survey في بيئتك وقم بتوثيق مواقعها على الشبكة
2. طبق فوراً أحدث تصحيح أمني من Checkbox لـ CheckboxWeb.dll
3. إذا لم يكن التصحيح ممكناً فوراً، افصل الأنظمة المتأثرة عن الإنترنت أو ضعها خلف جدار حماية تطبيقات ويب بضوابط وصول صارمة

إرشادات التصحيح:
1. قم بتنزيل أحدث إصدار معدل من موقع Checkbox الرسمي
2. قم بعمل نسخة احتياطية من إعدادات Checkbox Survey والقواعد البيانات الحالية قبل التصحيح
3. اختبر التصحيحات في بيئة غير الإنتاج أولاً
4. نشر التصحيحات خلال نوافذ الصيانة مع إجراءات التراجع جاهزة
5. تحقق من تثبيت التصحيح بفحص إصدار CheckboxWeb.dll وبصمة الملف

الضوابط البديلة (إذا لم يكن التصحيح الفوري ممكناً):
1. تطبيق تقسيم الشبكة لتقييد الوصول إلى Checkbox Survey للشبكات المصرح بها فقط
2. نشر قواعد جدار حماية تطبيقات الويب لحجب حمولات فك التسلسل المريبة
3. مراقبة محاولات الاستغلال باستخدام توقيعات IDS/IPS
4. تطبيق التحقق الصارم من المدخلات وتعطيل ميزات التسلسل غير الضرورية
5. تفعيل تسجيل مفصل لجميع الطلبات إلى نقاط نهاية Checkbox Survey

قواعد الكشف:
1. مراقبة طلبات POST إلى نقاط نهاية CheckboxWeb.dll بأنماط كائنات مسلسلة مريبة
2. تنبيه عند تنفيذ أي عمليات فرعية من مجموعة تطبيقات Checkbox Survey
3. مراقبة الاتصالات الخارجية غير المعتادة من خوادم Checkbox Survey
4. تتبع محاولات المصادقة الفاشلة والناجحة لنقاط نهاية الاستطلاع
5. مراقبة تعديلات سلامة ملف CheckboxWeb.dll
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.12.6.1 - Management of technical vulnerabilities ECC 2024 A.14.2.1 - Secure development policy ECC 2024 A.12.3.1 - Configuration management ECC 2024 A.12.4.1 - Event logging
🔵 SAMA CSF
SAMA CSF ID.RA-1 - Asset Management and Inventory SAMA CSF PR.IP-12 - Security patch management SAMA CSF DE.CM-1 - Detection and monitoring SAMA CSF RS.MI-1 - Incident response procedures
🟡 ISO 27001:2022
ISO 27001:2022 A.12.3.1 - Configuration management 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
PCI DSS 6.2 - Security patch management PCI DSS 11.2 - Vulnerability scanning PCI DSS 6.1 - Secure development processes
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Checkbox:Checkbox Survey
📊 CVSS Score
9.0
/ 10.0 — Critical
📋 Quick Facts
Severity Critical
CVSS Score9.0
EPSS25.55%
Exploit ✓ Yes
Patch ✓ Yes
CISA KEV🇺🇸 Yes
KEV Due Date2022-05-02
Published 2022-04-11
Source Feed cisa_kev
Views 1
🇸🇦 Saudi Risk Score
9.2
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
kev actively-exploited
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