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Vulnerabilities

CVE-2021-47944

High
CWE-789 — Weakness Type
Published: May 10, 2026  ·  Modified: May 17, 2026  ·  Source: NVD
CVSS v3
7.5
🔗 NVD Official
📄 Description (English)

memono Notepad 4.2 contains a denial of service vulnerability that allows attackers to crash the application by pasting excessively long character buffers into note fields. Attackers can generate a payload containing 350000 repeated characters and paste it twice into a new note to trigger an application crash on iOS devices.

🤖 AI Executive Summary

CVE-2021-47944 is a denial of service vulnerability in memono Notepad 4.2 affecting iOS devices, where attackers can crash the application by pasting extremely long character strings (350,000+ characters) into note fields. While no public exploit exists and no patch is available, the vulnerability poses a moderate risk to users relying on this application for note-taking and data management. Organizations using memono Notepad should implement immediate workarounds and consider alternative applications until a patch is released.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: May 13, 2026 22:42
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability has limited direct impact on critical Saudi sectors as memono Notepad is a consumer-grade note-taking application. However, government employees, healthcare professionals, and banking staff who use this application for sensitive note-taking could experience service disruption. The primary risk is to individual productivity and potential loss of unsaved notes rather than organizational infrastructure. Saudi organizations in healthcare (MOH), government agencies, and financial institutions should audit usage of this application among staff.
🏢 Affected Saudi Sectors
Government Healthcare Banking Telecommunications Education
⚖️ Saudi Risk Score (AI)
3.5
/ 10.0
🔧 Remediation Steps (English)
Immediate Actions:
1. Audit all devices within your organization to identify memono Notepad 4.2 installations
2. Communicate to users to avoid pasting large text blocks (>100,000 characters) into the application
3. Implement application usage policies restricting memono Notepad for sensitive data handling
4. Consider deploying alternative note-taking applications (Apple Notes, Microsoft OneNote) through MDM

Compensating Controls:
1. Enable automatic backup features in alternative applications
2. Implement Mobile Device Management (MDM) to restrict or monitor memono Notepad usage
3. Train users on safe copy-paste practices and character limits
4. Monitor for application crashes in device logs and correlate with memono usage

Detection:
1. Monitor iOS device logs for memono Notepad crashes
2. Alert on paste events exceeding 100,000 characters in note-taking applications
3. Track application force-closes and correlate with memono Notepad activity
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تدقيق جميع الأجهزة في المنظمة لتحديد تثبيتات memono Notepad 4.2
2. إبلاغ المستخدمين بتجنب لصق كتل نصية كبيرة (>100,000 حرف) في التطبيق
3. تطبيق سياسات استخدام التطبيقات تقيد memono Notepad للتعامل مع البيانات الحساسة
4. النظر في نشر تطبيقات بديلة للملاحظات (Apple Notes, Microsoft OneNote) عبر MDM

الضوابط البديلة:
1. تفعيل ميزات النسخ الاحتياطي التلقائي في التطبيقات البديلة
2. تطبيق إدارة الأجهزة المحمولة (MDM) لتقييد أو مراقبة استخدام memono Notepad
3. تدريب المستخدمين على ممارسات النسخ واللصق الآمنة وحدود الأحرف
4. مراقبة أعطال التطبيقات في سجلات الأجهزة والربط مع استخدام memono

الكشف:
1. مراقبة سجلات أجهزة iOS لأعطال memono Notepad
2. تنبيه على أحداث اللصق التي تتجاوز 100,000 حرف في تطبيقات الملاحظات
3. تتبع إغلاق التطبيقات القسري والربط مع نشاط memono Notepad
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.5.1 - Information Security Policies (application security requirements) ECC 2024 A.12.6 - Technical Vulnerability Management (identifying and managing application vulnerabilities) ECC 2024 A.14.2 - System Development and Maintenance (secure application deployment)
🔵 SAMA CSF
ID.BE-1 - Business Environment (understanding critical applications) PR.DS-6 - Data Security (protecting data in applications) DE.CM-1 - Detection and Analysis (monitoring application health)
🟡 ISO 27001:2022
A.12.2.1 - Change management procedures for applications A.12.6.1 - Management of technical vulnerabilities A.14.2.1 - Secure development policy
📊 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-789
EPSS0.04%
Exploit No
Patch ✗ No
Published 2026-05-10
Source Feed nvd
🇸🇦 Saudi Risk Score
3.5
/ 10.0 — Saudi Risk
Priority: LOW
🏷️ Tags
CWE-789
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