CVE-2021-37033
📋 TL;DR
This is an injection vulnerability in Huawei smartphones that allows attackers to inject malicious input into affected systems. Successful exploitation could disrupt service availability on vulnerable devices. Huawei smartphone users with unpatched devices are affected.
💻 Affected Systems
- Huawei smartphones
📦 What is this software?
Emui by Huawei
Magic Ui by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption on affected smartphones, potentially rendering core functions unusable until device restart or factory reset.
Likely Case
Temporary service degradation or crashes of specific applications/services on the device.
If Mitigated
No impact if patched or if input validation prevents injection.
🎯 Exploit Status
Requires user interaction or specific conditions for injection. CWE-74 indicates improper neutralization of special elements in output used by downstream components.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Huawei security bulletins for specific fixed versions
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 available security updates. 3. Restart device after update completes.
🔧 Temporary Workarounds
Avoid untrusted inputs
allDo not interact with suspicious links, messages, or applications that could trigger the injection.
🧯 If You Can't Patch
- Restrict device to trusted applications only from official app stores
- Implement mobile device management (MDM) controls to limit app installations and web access
🔍 How to Verify
Check if Vulnerable:
Check device model and software version in Settings > About phone, then compare with Huawei's security bulletin.Check Version:
Settings > About phone > Software versionVerify Fix Applied:
Verify software version after update matches or exceeds patched version listed in Huawei advisory.📡 Detection & Monitoring
Log Indicators:
- Unexpected application crashes
- Service termination logs
- Abnormal input processing errors
Network Indicators:
- Unusual outbound connections following suspicious input
SIEM Query:
Not typically applicable for consumer smartphone vulnerabilities