CVE-2021-22405
📋 TL;DR
A configuration defect in Huawei smartphones allows attackers to affect service availability through exploitation. This vulnerability impacts Huawei smartphone users running affected software versions. Successful exploitation could disrupt normal device functionality.
💻 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 Huawei smartphones, potentially rendering core device functions unavailable.
Likely Case
Partial service degradation affecting specific smartphone features or applications.
If Mitigated
Minimal impact with proper configuration hardening and network segmentation in place.
🎯 Exploit Status
Exploitation requires specific configuration manipulation; no public exploit code available based on provided information
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Huawei security bulletins for specific patched versions
Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2021/7/
Restart Required: Yes
Instructions:
1. Check device model and current software version. 2. Visit Huawei support site for July 2021 bulletins. 3. Download and install recommended security update. 4. Restart device after installation.
🔧 Temporary Workarounds
Configuration Hardening
allReview and secure device configuration settings to prevent exploitation vectors
Network Segmentation
allIsolate affected devices from untrusted networks to reduce attack surface
🧯 If You Can't Patch
- Isolate affected devices from production networks
- Implement strict access controls and monitor for unusual service disruption patterns
🔍 How to Verify
Check if Vulnerable:
Check device software version against Huawei's July 2021 security bulletins for affected versionsCheck Version:
Settings > About Phone > Software Information (exact path varies by Huawei model)Verify Fix Applied:
Verify software version has been updated to patched version listed in Huawei advisories📡 Detection & Monitoring
Log Indicators:
- Unexpected service termination logs
- Configuration change events without authorization
- Abnormal system process behavior
Network Indicators:
- Unusual network traffic patterns from affected devices
- Service availability monitoring alerts
SIEM Query:
device_vendor:Huawei AND (event_type:service_stop OR config_change:true) AND severity:high