CVE-2021-37109
📋 TL;DR
This vulnerability allows attackers to bypass security protections in Huawei modem firmware, potentially leading to memory protection failures. It affects Huawei devices with vulnerable modem firmware versions. Successful exploitation could compromise device integrity and security controls.
💻 Affected Systems
- Huawei smartphones and devices with vulnerable modem firmware
📦 What is this software?
Emui by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of modem functionality allowing arbitrary code execution, device takeover, and potential lateral movement to connected networks.
Likely Case
Memory corruption leading to denial of service, privilege escalation, or bypass of security controls on affected devices.
If Mitigated
Limited impact with proper network segmentation, updated firmware, and security monitoring in place.
🎯 Exploit Status
Exploitation likely requires local access or specialized modem interaction; no public exploit code available
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Huawei security updates for specific device models
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2022/2/
Restart Required: Yes
Instructions:
1. Check Huawei security bulletin for affected devices. 2. Apply latest firmware updates from Huawei. 3. Reboot device after update installation.
🔧 Temporary Workarounds
Network segmentation
allIsolate affected devices from critical networks to limit potential impact
Disable unnecessary modem features
allReduce attack surface by disabling unused modem functionalities
🧯 If You Can't Patch
- Isolate affected devices in separate network segments with strict access controls
- Implement additional monitoring for unusual modem activity or memory corruption events
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against Huawei security bulletins; examine modem firmware version in device settingsCheck Version:
Check device settings > About phone > Build number/Software versionVerify Fix Applied:
Verify firmware version has been updated to patched version specified in Huawei advisory📡 Detection & Monitoring
Log Indicators:
- Unusual modem activity logs
- Memory protection violation events
- Unexpected firmware modification attempts
Network Indicators:
- Anomalous modem communication patterns
- Unexpected baseband processor activity
SIEM Query:
Search for modem firmware modification events or memory protection failures in device logs