CVE-2021-30259
📋 TL;DR
This vulnerability allows out-of-bounds memory access due to improper validation of function table entries in Qualcomm Snapdragon chipsets. Attackers could potentially execute arbitrary code or cause denial of service. Affected devices include those using Snapdragon Auto, Compute, Connectivity, Consumer IOT, Industrial IOT, Mobile, Voice & Music, Wearables, and Wired Infrastructure and Networking chipsets.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Connectivity
- Snapdragon Consumer IOT
- Snapdragon Industrial IOT
- Snapdragon Mobile
- Snapdragon Voice & Music
- Snapdragon Wearables
- Snapdragon Wired Infrastructure and Networking
📦 What is this software?
Sd7c Firmware by Qualcomm
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or persistent backdoor installation.
Likely Case
Local privilege escalation or denial of service affecting device stability.
If Mitigated
Limited impact with proper memory protection mechanisms and security updates applied.
🎯 Exploit Status
Exploitation likely requires local access or ability to execute code on the device.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Qualcomm November 2021 security bulletin for specific chipset updates
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/november-2021-bulletin
Restart Required: Yes
Instructions:
1. Check with device manufacturer for firmware updates. 2. Apply Qualcomm-provided patches through OEM updates. 3. Reboot device after update installation.
🔧 Temporary Workarounds
Restrict local access
allLimit physical and logical access to vulnerable devices to reduce attack surface.
🧯 If You Can't Patch
- Isolate affected devices from critical networks
- Implement strict access controls and monitoring
🔍 How to Verify
Check if Vulnerable:
Check device chipset model and firmware version against Qualcomm advisoryCheck Version:
Device-specific commands vary by manufacturer (e.g., Android: Settings > About phone > Build number)Verify Fix Applied:
Verify firmware version has been updated to post-November 2021 security patch level📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Memory access violation errors
- Unexpected process crashes
Network Indicators:
- Unusual outbound connections from embedded devices
SIEM Query:
Search for kernel error messages containing 'out of bounds' or 'memory corruption' on affected devices