CVE-2021-30347
📋 TL;DR
This vulnerability in Qualcomm Snapdragon chipsets allows improper integrity checks leading to race conditions between PDCP and RRC tasks after receiving valid RRC command packets. Attackers could potentially execute arbitrary code or cause denial of service. Affects devices using vulnerable Snapdragon Auto, Compute, Connectivity, Industrial IoT, and Mobile platforms.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Connectivity
- Snapdragon Industrial IOT
- Snapdragon Mobile
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with kernel privileges leading to complete device compromise, data theft, or persistent backdoor installation.
Likely Case
Denial of service causing device crashes, reboots, or loss of cellular connectivity functionality.
If Mitigated
Limited impact with proper network segmentation and security controls preventing exploitation attempts.
🎯 Exploit Status
Exploitation requires specialized knowledge of cellular protocols and chipset internals; race condition timing makes reliable exploitation challenging.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check with device manufacturer for specific firmware updates
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/april-2022-bulletin
Restart Required: Yes
Instructions:
1. Contact device manufacturer for firmware updates. 2. Apply Qualcomm-provided patches through OEM update channels. 3. Reboot device after update installation.
🔧 Temporary Workarounds
Network Segmentation
allIsolate vulnerable devices from untrusted networks and implement strict firewall rules for cellular data traffic.
Baseband Monitoring
allImplement monitoring for abnormal baseband behavior or unexpected RRC command patterns.
🧯 If You Can't Patch
- Implement strict network access controls and segment vulnerable devices
- Monitor for device crashes, reboots, or abnormal cellular connectivity behavior
🔍 How to Verify
Check if Vulnerable:
Check device specifications against Qualcomm's affected products list and verify firmware version with manufacturer.Check Version:
Device-specific commands vary by manufacturer; typically 'getprop' on Android or manufacturer diagnostic toolsVerify Fix Applied:
Confirm firmware version has been updated to manufacturer's patched version and monitor for stability.📡 Detection & Monitoring
Log Indicators:
- Unexpected device reboots
- Baseband crashes
- Cellular connectivity failures
- Kernel panic logs
Network Indicators:
- Abnormal RRC command patterns
- Unexpected cellular protocol traffic
SIEM Query:
Search for: (event_category="crash" OR event_category="reboot") AND (device_type="mobile" OR device_type="iot")