CVE-2021-22345
📋 TL;DR
This CVE describes an input verification vulnerability in Huawei smartphones that allows out-of-bounds memory writes. Attackers can exploit this to potentially execute arbitrary code or cause system crashes. All users of affected Huawei smartphone models are at risk.
💻 Affected Systems
- Huawei smartphones
📦 What is this software?
Emui by Huawei
Emui by Huawei
Emui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing remote code execution, data theft, and persistent backdoor installation.
Likely Case
Application crashes, denial of service, or limited code execution in sandboxed context.
If Mitigated
No impact if patched; reduced risk with network segmentation and security controls.
🎯 Exploit Status
CVSS 9.8 suggests critical severity with network-based exploitation possible without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in provided references
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2021/5/
Restart Required: Yes
Instructions:
1. Check for security updates in device Settings > System & updates > Software update. 2. Install any available updates. 3. Restart device after installation.
🔧 Temporary Workarounds
Disable untrusted app installations
androidPrevent installation of apps from unknown sources to reduce attack vectors
Settings > Security > Install unknown apps > Disable for all apps
Network segmentation
allIsolate vulnerable devices from critical networks
🧯 If You Can't Patch
- Isolate affected devices on separate network segments
- Implement strict application allowlisting and monitor for unusual behavior
🔍 How to Verify
Check if Vulnerable:
Check device model and EMUI version in Settings > About phone. Compare with Huawei security bulletins.Check Version:
adb shell getprop ro.build.version.emui (for connected devices)Verify Fix Applied:
Verify security patch level in Settings > About phone > Build number matches May 2021 or later.📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes
- Memory access violation logs
- Unusual system service activity
Network Indicators:
- Unexpected network connections from device
- Suspicious download patterns
SIEM Query:
device_vendor:Huawei AND (event_type:crash OR memory_violation) AND severity:high