CVE-2021-30350
📋 TL;DR
This vulnerability in Qualcomm Snapdragon chipsets allows memory corruption due to insufficient validation of MBN header size against input buffer. Attackers could potentially execute arbitrary code or cause denial of service on affected devices. It impacts various Snapdragon platforms including automotive, compute, connectivity, consumer IoT, industrial IoT, and wearables.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Connectivity
- Snapdragon Consumer IOT
- Snapdragon Industrial IOT
- Snapdragon Wearables
📦 What is this software?
Sd7c Firmware by Qualcomm
⚠️ 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, potentially requiring physical reset.
If Mitigated
Limited impact with proper network segmentation and security controls in place.
🎯 Exploit Status
Memory corruption vulnerabilities in baseband/firmware components typically require specialized knowledge but can be exploited via crafted network packets or local access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware updates released in April 2022 security bulletin
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 affected devices from untrusted networks to limit attack surface
Access control restrictions
allImplement strict network access controls and firewall rules for affected devices
🧯 If You Can't Patch
- Segment affected devices in isolated network zones with strict ingress/egress filtering
- Implement monitoring for abnormal device behavior or crashes that could indicate exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware/baseband version against manufacturer's security bulletin. For Android devices: Settings > About phone > Baseband versionCheck Version:
Android: adb shell getprop gsm.version.baseband | Linux-based: dmesg | grep -i basebandVerify Fix Applied:
Verify firmware version has been updated to post-April 2022 release and check for absence of related crashes in system logs📡 Detection & Monitoring
Log Indicators:
- Kernel panics
- Baseband processor crashes
- Unexpected device reboots
- Memory corruption errors in system logs
Network Indicators:
- Unusual baseband communication patterns
- Malformed MBN packets to affected devices
SIEM Query:
Device logs containing 'panic', 'crash', 'corruption' OR network traffic to baseband ports with abnormal packet sizes