CVE-2021-37004
📋 TL;DR
This CVE describes an improper input validation vulnerability in Huawei smartphones that allows attackers to cause kernel crashes. Successful exploitation leads to denial of service conditions. Affected devices include specific Huawei smartphone models running HarmonyOS.
💻 Affected Systems
- Huawei smartphones
📦 What is this software?
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash requiring reboot, potential data loss from unsaved work, and temporary denial of service.
Likely Case
Device instability, application crashes, and temporary unavailability of smartphone functions.
If Mitigated
No impact if patched or if exploit attempts are blocked by security controls.
🎯 Exploit Status
Exploitation requires local access or malicious application installation. No public exploit code is known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: HarmonyOS 2.0.0.230 and later
Vendor Advisory: https://device.harmonyos.com/cn/docs/security/update/security-bulletins-202108-0000001180965965
Restart Required: Yes
Instructions:
1. Navigate to Settings > System & updates > Software update. 2. Check for updates. 3. Download and install HarmonyOS 2.0.0.230 or later. 4. Restart device when prompted.
🔧 Temporary Workarounds
Restrict app installations
allOnly install applications from trusted sources like Huawei AppGallery
Disable developer options
allTurn off USB debugging and developer options to reduce attack surface
🧯 If You Can't Patch
- Isolate affected devices from critical networks and data
- Implement application allowlisting to prevent malicious app installation
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in Settings > About phone > HarmonyOS versionCheck Version:
Not applicable - check via device settings UIVerify Fix Applied:
Verify HarmonyOS version is 2.0.0.230 or higher in Settings > About phone📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Unexpected device reboots
- System crash reports
Network Indicators:
- No network-based indicators for this local vulnerability
SIEM Query:
Device logs showing kernel crashes or unexpected reboots on Huawei HarmonyOS devices