CVE-2021-37046
📋 TL;DR
This vulnerability in Huawei smartphones allows attackers to trigger memory exhaustion through the codec detection module, causing device restarts. It affects Huawei smartphone users running vulnerable software versions. The memory leak can be exploited to cause denial of service.
💻 Affected Systems
- Huawei smartphones
📦 What is this software?
Emui by Huawei
Magic Ui by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Persistent denial of service through repeated exploitation causing continuous device restarts, potentially rendering the device unusable.
Likely Case
Temporary device restart causing service disruption and potential data loss from unsaved work.
If Mitigated
Minimal impact if patched or if device has memory monitoring that prevents exhaustion.
🎯 Exploit Status
Exploitation requires user interaction with malicious media content; no public exploit code is known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Huawei security bulletins for specific patched versions
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2021/9/
Restart Required: Yes
Instructions:
1. Check for system updates in device settings. 2. Install available security updates. 3. Restart device after update installation.
🔧 Temporary Workarounds
Avoid untrusted media sources
allPrevent processing of malicious media files that could trigger the vulnerability
Disable automatic media processing
allConfigure apps to not automatically process media files from untrusted sources
🧯 If You Can't Patch
- Monitor device for unusual memory usage patterns and restart behavior
- Use device management tools to restrict media processing from untrusted sources
🔍 How to Verify
Check if Vulnerable:
Check device software version against Huawei security bulletins for September 2021Check Version:
Settings > About phone > Software information (exact path varies by device)Verify Fix Applied:
Verify installed software version matches or exceeds patched versions listed in Huawei advisories📡 Detection & Monitoring
Log Indicators:
- Repeated device restarts
- High memory usage by media/codec processes
- Out of memory errors in system logs
Network Indicators:
- Unusual media file downloads preceding restarts
SIEM Query:
Device logs showing pattern: 'memory exhaustion' OR 'out of memory' AND 'codec' OR 'media' process