CVE-2021-37030
📋 TL;DR
This CVE describes an improper permission vulnerability in Huawei smartphones that allows attackers to bypass intended access controls. Successful exploitation could affect service availability on affected devices. This impacts users of specific Huawei smartphone models running vulnerable software versions.
💻 Affected Systems
- Huawei smartphones
📦 What is this software?
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
⚠️ Risk & Real-World Impact
Worst Case
An attacker could gain elevated privileges, potentially compromising device integrity, accessing sensitive data, or disrupting critical services on the smartphone.
Likely Case
Service disruption or denial of service affecting specific smartphone functions, potentially leading to temporary unavailability of certain features.
If Mitigated
With proper access controls and patching, the vulnerability would be prevented from being exploited, maintaining normal device functionality.
🎯 Exploit Status
Exploitation likely requires some level of access to the device. No public exploit code has been identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: August 2021 security patch or later
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2021/8/
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System & updates > Software update. 2. Install the August 2021 security patch or later. 3. Restart the device after installation.
🔧 Temporary Workarounds
Limit app permissions
allReview and restrict unnecessary app permissions to reduce attack surface
Disable unnecessary services
allTurn off Bluetooth, Wi-Fi, and other services when not in use
🧯 If You Can't Patch
- Isolate the device from critical networks and sensitive data
- Implement strict access controls and monitor for unusual activity
🔍 How to Verify
Check if Vulnerable:
Check Settings > About phone > Build number and compare against Huawei's August 2021 security bulletinCheck Version:
Not applicable for consumer smartphones - use device settings menuVerify Fix Applied:
Verify the security patch level is August 2021 or later in Settings > About phone📡 Detection & Monitoring
Log Indicators:
- Unusual permission requests
- Failed access attempts to restricted areas
- Service disruption logs
Network Indicators:
- Unusual network activity from the device
- Attempts to access restricted services
SIEM Query:
Not typically applicable for consumer smartphone vulnerabilities