CVE-2021-37066
📋 TL;DR
CVE-2021-37066 is an out-of-bounds read vulnerability in Huawei smartphones running HarmonyOS. Successful exploitation can cause process crashes, potentially leading to denial of service. This affects Huawei smartphone users running vulnerable HarmonyOS versions.
💻 Affected Systems
- Huawei smartphones running HarmonyOS
📦 What is this software?
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Process crash leading to denial of service, potentially disrupting phone functionality until reboot.
Likely Case
Application or system process crash requiring restart of affected component.
If Mitigated
No impact if patched or if exploit attempts are blocked by security controls.
🎯 Exploit Status
Out-of-bounds read vulnerabilities typically require specific conditions to trigger. No public exploit code was available at disclosure.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: HarmonyOS 2.0.0.230 or later
Vendor Advisory: https://device.harmonyos.com/en/docs/security/update/security-bulletins-202109-0000001196270727
Restart Required: Yes
Instructions:
1. Check current HarmonyOS version in Settings > System & updates > Software update. 2. If version is before 2.0.0.230, download and install the latest update. 3. Reboot device after installation completes.
🔧 Temporary Workarounds
No effective workarounds
allThis is a core OS vulnerability requiring patching. No configuration changes or workarounds are available.
🧯 If You Can't Patch
- Restrict device usage to trusted applications only
- Monitor for abnormal application crashes or system instability
🔍 How to Verify
Check if Vulnerable:
Navigate to Settings > System & updates > Software update and check HarmonyOS version. If version is earlier than 2.0.0.230, device is vulnerable.Check Version:
Not applicable - check via device Settings menuVerify Fix Applied:
After updating, verify HarmonyOS version is 2.0.0.230 or later in Settings > System & updates > Software update.📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes in system logs
- Application crash reports for system components
Network Indicators:
- No network indicators for this local vulnerability
SIEM Query:
Not applicable - local device vulnerability without network exploitation