CVE-2021-37041
📋 TL;DR
CVE-2021-37041 is an out-of-bounds read vulnerability in Huawei smartphones caused by improper input verification. This allows attackers to read memory beyond allocated buffers, potentially exposing sensitive information. Affected users are Huawei smartphone owners running vulnerable software versions.
💻 Affected Systems
- Huawei smartphones
📦 What is this software?
Emui by Huawei
Emui by Huawei
Emui by Huawei
Emui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
Magic Ui by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Information disclosure leading to exposure of sensitive data like authentication tokens, passwords, or personal information from device memory.
Likely Case
Application crash or denial of service, with potential limited information leakage depending on memory layout.
If Mitigated
Minimal impact with proper memory protections and ASLR, though some information leakage may still occur.
🎯 Exploit Status
Requires local access or malicious app installation; no known widespread exploitation
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: September 2021 and October 2021 security patches
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2021/9/
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
Disable unknown sources
allPrevent installation of apps from untrusted sources
Settings > Security > Install unknown apps > Disable for all apps
App verification
allEnable Google Play Protect and app scanning
Settings > Security > Google Play Protect > Scan device for security threats
🧯 If You Can't Patch
- Restrict physical access to device
- Use app whitelisting and only install trusted applications from official stores
🔍 How to Verify
Check if Vulnerable:
Check Settings > About phone > Build number against Huawei security bulletinsCheck Version:
Settings > About phone > Build numberVerify Fix Applied:
Verify September 2021 or later security patch is installed in Settings > About phone📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Unexpected process terminations
Network Indicators:
- Unusual outbound data transfers from device
SIEM Query:
Process termination events with exit code indicating memory access violation