CVE-2020-11203
📋 TL;DR
This vulnerability is a stack buffer overflow in Qualcomm Snapdragon chipsets that occurs when processing GSM/WCDMA broadcast configuration data. Attackers could exploit this to execute arbitrary code or cause denial of service on affected devices. The vulnerability affects multiple Snapdragon product lines including Auto, Mobile, Wearables, and IoT devices.
💻 Affected Systems
- Snapdragon Auto
- Sndapdragon Connectivity
- Snapdragon Consumer IOT
- Snapdragon Industrial IOT
- Snapdragon Mobile
- Snapdragon Wearables
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data theft, or persistent backdoor installation
Likely Case
Denial of service causing device crashes or instability
If Mitigated
Limited impact with proper input validation and memory protections
🎯 Exploit Status
Exploitation requires ability to send specially crafted GSM/WCDMA broadcast messages to target device
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware updates released in February 2021 security bulletin
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/february-2021-bulletin
Restart Required: Yes
Instructions:
1. Check device manufacturer for firmware updates. 2. Apply Qualcomm-provided firmware patches. 3. Reboot device to activate new firmware.
🔧 Temporary Workarounds
Network filtering
allFilter malicious GSM/WCDMA broadcast messages at network level
🧯 If You Can't Patch
- Isolate affected devices from untrusted cellular networks
- Implement network monitoring for abnormal broadcast traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against manufacturer's patched versions; examine Qualcomm chipset firmware versionCheck Version:
Device-specific commands vary by manufacturer; typically in Settings > About Phone > Baseband versionVerify Fix Applied:
Verify firmware version has been updated to post-February 2021 release📡 Detection & Monitoring
Log Indicators:
- Baseband processor crashes
- Radio interface errors
- Unexpected device reboots
Network Indicators:
- Abnormal GSM/WCDMA broadcast traffic
- Suspicious cellular network interactions
SIEM Query:
Not applicable - primarily firmware/radio level vulnerability