CVE-2021-46786
📋 TL;DR
This vulnerability in Huawei audio modules allows attackers to trigger out-of-bounds memory access by passing malicious parameters. It affects Huawei smartphones and devices running HarmonyOS. Successful exploitation could lead to arbitrary code execution or system crashes.
💻 Affected Systems
- Huawei smartphones
- Huawei tablets
- Huawei devices with HarmonyOS
📦 What is this software?
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Harmonyos by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with kernel privileges leading to complete device compromise
Likely Case
Application crashes, denial of service, or limited privilege escalation
If Mitigated
No impact if patched or proper input validation is implemented
🎯 Exploit Status
Requires malicious application installation or local access to device
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: HarmonyOS security updates from May 2022 onward
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2022/5/
Restart Required: Yes
Instructions:
1. Check for system updates in device settings. 2. Install latest security patch. 3. Restart device after installation.
🔧 Temporary Workarounds
Restrict app permissions
allLimit audio permissions for untrusted applications
Disable unnecessary audio services
allTurn off audio processing features not in use
🧯 If You Can't Patch
- Isolate affected devices from untrusted networks
- Implement strict app installation policies and only use trusted sources
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in Settings > About phone > HarmonyOS versionCheck Version:
Not applicable - check via device settings interfaceVerify Fix Applied:
Verify installed security patch date is May 2022 or later in Settings > Security > Security update📡 Detection & Monitoring
Log Indicators:
- Audio service crashes
- Memory access violation logs
- Suspicious parameter validation failures
Network Indicators:
- Unusual audio-related network traffic from apps
SIEM Query:
Not applicable for mobile device logs🔗 References
- https://consumer.huawei.com/en/support/bulletin/2022/5/
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-phones-202205-0000001245813162
- https://consumer.huawei.com/en/support/bulletin/2022/5/
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-phones-202205-0000001245813162
