CVE-2021-22484
📋 TL;DR
This vulnerability in Huawei wearables allows attackers to cause server out-of-memory conditions by sending specially crafted data that exceeds expected size limits. The flaw exists in data reading functions that fail to validate actual data size. Affected users include anyone using vulnerable Huawei wearable devices.
💻 Affected Systems
- Huawei wearables (specific models not detailed in advisory)
📦 What is this software?
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Complete server crash due to out-of-memory condition, disrupting all wearable device functionality and potentially causing denial of service to all connected devices.
Likely Case
Service disruption or performance degradation on affected wearables, potentially causing temporary loss of functionality until system recovers.
If Mitigated
Minimal impact with proper input validation and memory management controls in place.
🎯 Exploit Status
Exploitation requires ability to send data to the wearable device, likely through Bluetooth or companion app connection. No public exploit code has been observed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: August 2021 security patch
Vendor Advisory: https://device.harmonyos.com/en/docs/security/update/security-bulletins-wearables-202108-0000001135186780
Restart Required: Yes
Instructions:
1. Check for updates in device settings. 2. Install August 2021 security patch. 3. Restart device after installation. 4. Verify patch installation in security update history.
🔧 Temporary Workarounds
Disable unnecessary connections
allLimit Bluetooth connections to trusted devices only and disable unused wireless features
Update companion apps
allEnsure Huawei Health or other companion apps are updated to latest versions
🧯 If You Can't Patch
- Isolate wearable devices from untrusted networks and connections
- Monitor device performance for unusual memory usage patterns
🔍 How to Verify
Check if Vulnerable:
Check device security patch level in Settings > System & updates > Software update. If patch level is before August 2021, device is vulnerable.Check Version:
Not applicable - check through device settings interfaceVerify Fix Applied:
Verify August 2021 security patch is installed in Settings > Security > Security update > Update history📡 Detection & Monitoring
Log Indicators:
- Unusual memory consumption patterns
- Device restart events
- Connection attempts from unknown sources
Network Indicators:
- Unusual Bluetooth connection patterns
- Excessive data transmission to wearable
SIEM Query:
Not applicable for typical wearable deployments