CVE-2021-22474
📋 TL;DR
This is a critical out-of-bounds memory access vulnerability in Huawei smartphones that allows attackers to cause process exceptions or potentially execute arbitrary code. It affects Huawei smartphone users running vulnerable software versions. The high CVSS score indicates this is a severe remote code execution risk.
💻 Affected Systems
- Huawei smartphones
📦 What is this software?
Emui by Huawei
Magic Ui by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data theft, or persistent backdoor installation.
Likely Case
Application crashes, denial of service, or limited code execution within the affected process context.
If Mitigated
Process termination with minimal system impact if proper memory protections and exploit mitigations are enabled.
🎯 Exploit Status
Out-of-bounds memory access vulnerabilities typically require some level of exploit development but can be weaponized once understood.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Huawei security update for July 2021 or later
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2021/7/
Restart Required: Yes
Instructions:
1. Go to Settings > System & updates > Software update. 2. Check for updates. 3. Install any available security updates. 4. Restart device when prompted.
🔧 Temporary Workarounds
Disable untrusted app installations
allPrevent installation of apps from unknown sources to reduce attack surface.
Settings > Security > Install unknown apps > Disable for all apps
Use app sandboxing
allEnsure all apps run with minimal permissions and in isolated environments.
Settings > Apps > [App Name] > Permissions > Review and restrict permissions
🧯 If You Can't Patch
- Isolate device on network segments with limited access to critical systems
- Implement mobile device management (MDM) with strict app whitelisting policies
🔍 How to Verify
Check if Vulnerable:
Check Settings > About phone > Build number against Huawei's July 2021 security bulletin affected versions list.Check Version:
Settings > About phone > Build numberVerify Fix Applied:
Verify security patch level includes July 2021 or later in Settings > About phone > Build number.📡 Detection & Monitoring
Log Indicators:
- Process crash logs for affected Huawei system services
- Memory access violation logs in system diagnostics
Network Indicators:
- Unusual network connections from system processes
- Suspicious payload delivery to device
SIEM Query:
device_vendor:Huawei AND (process_crash OR memory_violation) AND severity:high