CVE-2021-22373
📋 TL;DR
This vulnerability in Huawei smartphones involves design process defects that could allow attackers to compromise service integrity and availability. It affects Huawei smartphone users who haven't applied security updates. Successful exploitation could disrupt device functionality and potentially allow unauthorized access to services.
💻 Affected Systems
- Huawei smartphones
📦 What is this software?
Emui by Huawei
Emui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to disrupt critical smartphone services, potentially enabling remote code execution or denial of service affecting core device functionality.
Likely Case
Service disruption affecting specific smartphone features or applications, potentially leading to data corruption or temporary unavailability of device services.
If Mitigated
Limited impact with proper security controls, potentially affecting only non-critical services with minimal data exposure.
🎯 Exploit Status
No public exploit details available; vulnerability requires design process defects exploitation which typically requires specific conditions
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: May 2021 security update
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2021/5/
Restart Required: Yes
Instructions:
1. Check for updates in Settings > System & updates > Software update. 2. Download and install May 2021 security update. 3. Restart device after installation completes.
🔧 Temporary Workarounds
Disable unnecessary services
allReduce attack surface by disabling non-essential smartphone services and features
Network segmentation
allIsolate affected devices from critical network segments
🧯 If You Can't Patch
- Isolate affected devices from corporate networks and internet access
- Implement strict application whitelisting and monitor for unusual service behavior
🔍 How to Verify
Check if Vulnerable:
Check device security patch level in Settings > About phone > Build number; if before May 2021, device is likely vulnerableCheck Version:
Settings > About phone > Build number (no CLI command available for consumer devices)Verify Fix Applied:
Verify security patch level shows May 2021 or later in Settings > About phone📡 Detection & Monitoring
Log Indicators:
- Unexpected service crashes
- Unusual system process behavior
- Failed service initialization attempts
Network Indicators:
- Unusual outbound connections from smartphone services
- Service disruption patterns
SIEM Query:
Device logs showing repeated service failures or unexpected process terminations on Huawei devices