CVE-2021-37015
📋 TL;DR
This is an out-of-bounds read vulnerability in Huawei smartphone kernels that allows attackers to read memory beyond allocated buffers. Successful exploitation can cause kernel crashes, leading to denial of service. Affected devices include Huawei smartphones running HarmonyOS or EMUI.
💻 Affected Systems
- Huawei smartphones
📦 What is this software?
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Kernel crash causing device reboot and potential data corruption or permanent device instability.
Likely Case
Temporary denial of service through device crash/reboot, disrupting device functionality.
If Mitigated
No impact if patched; unpatched devices remain vulnerable to crashes.
🎯 Exploit Status
Requires local access or malicious app execution; no public exploit code available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: HarmonyOS 2.0.0.230 and later, EMUI with August 2021 security patches
Vendor Advisory: https://device.harmonyos.com/cn/docs/security/update/security-bulletins-202108-0000001180965965
Restart Required: Yes
Instructions:
1. Check for system updates in device Settings > System & updates > Software update. 2. Install available security updates. 3. Reboot device after installation.
🔧 Temporary Workarounds
Restrict app installations
allOnly install apps from trusted sources like official app stores to reduce risk of malicious apps exploiting the vulnerability.
🧯 If You Can't Patch
- Isolate affected devices from critical networks and limit user access.
- Monitor for unusual device crashes or reboots as potential exploitation indicators.
🔍 How to Verify
Check if Vulnerable:
Check device OS version in Settings > About phone > HarmonyOS version or EMUI version.Check Version:
Not applicable - check via device settings UI.Verify Fix Applied:
Verify OS version is HarmonyOS 2.0.0.230+ or EMUI with August 2021+ security patches.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Unexpected device reboots
- Crash reports in system logs
Network Indicators:
- None - local exploitation only
SIEM Query:
Not applicable for typical mobile device management.