CVE-2021-1887
📋 TL;DR
This vulnerability in Qualcomm Snapdragon chipsets allows attackers to trigger a denial-of-service condition via the Wi-Fi Fine Timing Measurement protocol. It affects networking infrastructure devices using vulnerable Snapdragon components. Successful exploitation could crash the WLAN subsystem.
💻 Affected Systems
- Qualcomm Snapdragon Wired Infrastructure and Networking chipsets
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete denial of service on affected networking devices, disrupting Wi-Fi connectivity and potentially requiring physical intervention to restore functionality.
Likely Case
Temporary Wi-Fi service disruption on affected devices, potentially affecting multiple connected clients until system recovery.
If Mitigated
Limited impact with proper network segmentation and monitoring, potentially isolated to specific network segments.
🎯 Exploit Status
Exploitation requires proximity to Wi-Fi network and knowledge of FTM protocol manipulation
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches available through Qualcomm component updates
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/july-2021-bulletin
Restart Required: Yes
Instructions:
1. Contact device manufacturer for firmware updates 2. Apply Qualcomm-provided patches 3. Reboot affected devices
🔧 Temporary Workarounds
Disable Wi-Fi FTM
allDisable Fine Timing Measurement protocol if not required
Device-specific configuration commands vary by manufacturer
🧯 If You Can't Patch
- Segment affected devices on isolated network segments
- Implement strict access controls to limit who can connect to Wi-Fi networks
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against manufacturer's patched versionsCheck Version:
Device-specific command (varies by manufacturer)Verify Fix Applied:
Verify firmware version matches patched version from manufacturer📡 Detection & Monitoring
Log Indicators:
- Unexpected WLAN subsystem crashes
- Wi-Fi service restarts
Network Indicators:
- Unusual FTM protocol traffic patterns
- Wi-Fi connectivity disruptions
SIEM Query:
Search for WLAN subsystem error messages or service restarts