CVE-2021-40064
📋 TL;DR
CVE-2021-40064 is a heap-based buffer overflow vulnerability in Huawei HarmonyOS and EMUI system components. This vulnerability allows attackers to potentially crash affected systems or execute arbitrary code by sending specially crafted data. It affects Huawei smartphones and devices running vulnerable versions of HarmonyOS and EMUI.
💻 Affected Systems
- Huawei smartphones
- Huawei tablets
- Huawei devices with HarmonyOS/EMUI
📦 What is this software?
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Harmonyos by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or persistent backdoor installation.
Likely Case
System instability, crashes, or denial of service affecting device functionality.
If Mitigated
Limited impact with proper network segmentation and exploit prevention controls in place.
🎯 Exploit Status
Requires local access or ability to install malicious applications. No publicly available exploit code as of knowledge cutoff.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: HarmonyOS 2.0.0.230 and later, EMUI security patches March 2022 and later
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2022/3/
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System & updates > Software update. 2. Download and install available security updates. 3. Restart device after installation completes.
🔧 Temporary Workarounds
Restrict app installations
allOnly install applications from trusted sources like official app stores
Enable security features
allTurn on all available security settings including app verification
🧯 If You Can't Patch
- Isolate affected devices from critical networks and sensitive data
- Implement application allowlisting to prevent unauthorized app execution
🔍 How to Verify
Check if Vulnerable:
Check Settings > About phone > HarmonyOS/EMUI version. If version is earlier than 2.0.0.230 for HarmonyOS or lacks March 2022 security patches for EMUI, device is vulnerable.Check Version:
Settings navigation: Settings > About phone > HarmonyOS version or EMUI versionVerify Fix Applied:
Verify version shows HarmonyOS 2.0.0.230+ or EMUI with March 2022+ security patches in Settings > About phone.📡 Detection & Monitoring
Log Indicators:
- System crash logs
- Abnormal process termination
- Memory access violation errors
Network Indicators:
- Unusual outbound connections from system processes
- Anomalous data patterns to system components
SIEM Query:
Process: (termination OR crash) AND Component: (system_server OR hw_*) AND Memory: (overflow OR violation)🔗 References
- https://consumer.huawei.com/en/support/bulletin/2022/3/
- https://device.harmonyos.com/cn/docs/security/update/security-bulletins-phones-202203-0000001257385193
- https://consumer.huawei.com/en/support/bulletin/2022/3/
- https://device.harmonyos.com/cn/docs/security/update/security-bulletins-phones-202203-0000001257385193
