CVE-2021-22447
📋 TL;DR
This vulnerability in Huawei smartphones allows attackers to trigger a system reset by exploiting improper exception handling. It affects Huawei smartphone users who haven't applied security updates. The flaw could be used to cause denial of service through forced device reboots.
💻 Affected Systems
- Huawei smartphones
📦 What is this software?
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Persistent denial of service through repeated forced resets, potentially causing data loss or corruption during critical operations.
Likely Case
Temporary denial of service through device reboot, disrupting user activities and potentially causing minor data loss.
If Mitigated
No impact if patched; unpatched devices remain vulnerable to forced resets.
🎯 Exploit Status
Exploitation likely requires local access or malicious app installation; no public exploit details available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: June 2021 security update or later
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2021/6/
Restart Required: Yes
Instructions:
1. Go to Settings > System & updates > Software update. 2. Check for updates. 3. Install June 2021 security update or later. 4. Restart device when prompted.
🔧 Temporary Workarounds
Disable unknown sources
allPrevent installation of malicious apps that could exploit this vulnerability
Settings > Security > Install unknown apps > Disable for all apps
Restrict app permissions
allLimit system-level permissions for untrusted applications
Settings > Apps > [App Name] > Permissions > Revoke unnecessary permissions
🧯 If You Can't Patch
- Isolate device from untrusted networks and users
- Implement mobile device management with strict app whitelisting
🔍 How to Verify
Check if Vulnerable:
Check if device has June 2021 security update: Settings > About phone > Build numberCheck Version:
Not applicable for mobile devices; use Settings menu as describedVerify Fix Applied:
Verify June 2021 or later security patch is installed: Settings > About phone > Android security patch level📡 Detection & Monitoring
Log Indicators:
- Unexpected system reboots
- Crash logs showing exception handling failures
Network Indicators:
- No direct network indicators for this local vulnerability
SIEM Query:
Not applicable for typical mobile device management scenarios