CVE-2021-37095
📋 TL;DR
This integer overflow vulnerability in Huawei smartphones allows attackers to cause denial of service or potentially execute arbitrary code remotely. It affects Huawei devices running HarmonyOS. Successful exploitation could compromise device security and user data.
💻 Affected Systems
- Huawei smartphones
📦 What is this software?
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data theft, and persistent backdoor installation.
Likely Case
Remote denial of service causing device crashes or instability, potentially requiring factory reset.
If Mitigated
Limited impact with proper network segmentation and security controls, potentially only causing temporary service disruption.
🎯 Exploit Status
CVSS 9.8 indicates critical severity with network-based attack vector and no authentication required. Specific exploitation details not publicly documented.
🛠️ 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 prior to 2.0.0.230, download and install the latest update. 3. Restart device after installation completes.
🔧 Temporary Workarounds
Network segmentation
allRestrict device network access to trusted networks only
Disable unnecessary services
allTurn off Bluetooth, Wi-Fi, and mobile data when not in use
🧯 If You Can't Patch
- Isolate affected devices on separate network segments with strict firewall rules
- Implement application allowlisting to prevent unauthorized code execution
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in Settings > System & updates > Software update. If version is below 2.0.0.230, device is vulnerable.Check Version:
Settings > System & updates > Software update (no CLI command available)Verify Fix Applied:
Confirm HarmonyOS version is 2.0.0.230 or higher in Settings > System & updates > Software update.📡 Detection & Monitoring
Log Indicators:
- Unexpected device crashes
- Abnormal process termination
- Memory allocation failures
Network Indicators:
- Unusual network traffic to/from Huawei devices
- Connection attempts to unexpected ports
SIEM Query:
device_vendor:Huawei AND (event_type:crash OR memory_allocation_failure)