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Global ransomware Multiple Sectors / Enterprise CRITICAL 1h Global general Technology and Legal MEDIUM 1h Global ransomware Financial Services / Cryptocurrency CRITICAL 2h Global general Industrial Control Systems / Operational Technology HIGH 3h Global apt Managed Service Providers (MSPs) / IT Services HIGH 4h Global vulnerability Enterprise Software HIGH 4h Global general Cybersecurity Operations HIGH 4h Global general Cybersecurity Industry LOW 4h Global supply_chain Multiple Sectors CRITICAL 4h Global vulnerability Government/Federal Agencies HIGH 5h Global ransomware Multiple Sectors / Enterprise CRITICAL 1h Global general Technology and Legal MEDIUM 1h Global ransomware Financial Services / Cryptocurrency CRITICAL 2h Global general Industrial Control Systems / Operational Technology HIGH 3h Global apt Managed Service Providers (MSPs) / IT Services HIGH 4h Global vulnerability Enterprise Software HIGH 4h Global general Cybersecurity Operations HIGH 4h Global general Cybersecurity Industry LOW 4h Global supply_chain Multiple Sectors CRITICAL 4h Global vulnerability Government/Federal Agencies HIGH 5h Global ransomware Multiple Sectors / Enterprise CRITICAL 1h Global general Technology and Legal MEDIUM 1h Global ransomware Financial Services / Cryptocurrency CRITICAL 2h Global general Industrial Control Systems / Operational Technology HIGH 3h Global apt Managed Service Providers (MSPs) / IT Services HIGH 4h Global vulnerability Enterprise Software HIGH 4h Global general Cybersecurity Operations HIGH 4h Global general Cybersecurity Industry LOW 4h Global supply_chain Multiple Sectors CRITICAL 4h Global vulnerability Government/Federal Agencies HIGH 5h
Vulnerabilities

CVE-2021-47971

High
CWE-789 — Weakness Type
Published: May 16, 2026  ·  Modified: May 23, 2026  ·  Source: NVD
CVSS v3
7.5
🔗 NVD Official
📄 Description (English)

My Notes Safe 5.3 contains a denial of service vulnerability that allows attackers to crash the application by pasting excessively long character strings 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.

🤖 AI Executive Summary

My Notes Safe 5.3 is vulnerable to denial of service attacks when excessively long character strings (350,000+ characters) are pasted into note fields, causing application crashes. This vulnerability allows attackers to disrupt service availability without requiring authentication or special privileges.

📄 Description (Arabic)

ثغرة حجب الخدمة في My Notes Safe 5.3 تسمح للمهاجمين بتعطيل التطبيق بلصق سلاسل نصية طويلة جداً في حقول الملاحظات. يمكن تفعيل الثغرة بإدراج 350,000 حرف متكرر مرتين في ملاحظة جديدة، مما يسبب توقف فوري للتطبيق.

🤖 ملخص تنفيذي (AI)

تطبيق My Notes Safe الإصدار 5.3 يحتوي على ثغرة حجب الخدمة عند لصق سلاسل نصية طويلة جداً في حقول الملاحظات، مما يسبب توقف التطبيق. يمكن للمهاجمين استخدام حمولات تحتوي على 350,000 حرف متكرر لتعطيل الخدمة دون الحاجة للمصادقة.

🤖 AI Intelligence Analysis Analyzed: May 21, 2026 02:01
🇸🇦 Saudi Arabia Impact Assessment
Saudi Relevance: medium
🏢 Affected Saudi Sectors
government healthcare
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
7.0
/ 10.0
🔧 Remediation Steps (English)
Upgrade My Notes Safe to version 5.4 or later which includes input validation and length restrictions. Implement application-level input sanitization to reject note entries exceeding reasonable character limits (e.g., 100,000 characters). Monitor application logs for suspicious paste operations with unusually large payloads.
🔧 خطوات المعالجة (العربية)
قم بترقية My Notes Safe إلى الإصدار 5.4 أو أحدث الذي يتضمن التحقق من الإدخال وتقييد الطول. طبق التحقق من صحة الإدخال على مستوى التطبيق لرفض الملاحظات التي تتجاوز حد معقول (مثل 100,000 حرف). راقب سجلات التطبيق للعمليات المريبة.
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.12.1.1
🟡 ISO 27001:2022
A.12.1.1 A.12.1.2
📊 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 2026-05-16
Source Feed nvd
🇸🇦 Saudi Risk Score
7.0
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-789
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