CVE-2021-1943
📋 TL;DR
This vulnerability allows attackers to read memory beyond allocated buffer boundaries in Qualcomm Snapdragon chipsets when parsing beacon responses. It affects devices using vulnerable Snapdragon components across automotive, compute, connectivity, industrial IoT, mobile, and networking products. Successful exploitation could lead to information disclosure or system crashes.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Connectivity
- Snapdragon Industrial IOT
- Snapdragon Mobile
- Snapdragon Wired Infrastructure and Networking
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data exfiltration, or persistent backdoor installation
Likely Case
Denial of service through system crashes or reboots, potential information disclosure from adjacent memory
If Mitigated
Limited impact with proper network segmentation and updated firmware
🎯 Exploit Status
Exploitation requires sending specially crafted beacon frames to vulnerable devices; no public exploit code available as of knowledge cutoff
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware updates released in July 2021 security bulletin
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/july-2021-bulletin
Restart Required: Yes
Instructions:
1. Check device manufacturer for firmware updates. 2. Apply Qualcomm-provided firmware patches. 3. Reboot device after update. 4. Verify patch installation through version checks.
🔧 Temporary Workarounds
Disable vulnerable Wi-Fi interfaces
allTemporarily disable Wi-Fi functionality on affected devices
adb shell svc wifi disable
nmcli radio wifi off
Network segmentation
allIsolate vulnerable devices from untrusted networks
🧯 If You Can't Patch
- Segment affected devices on isolated network segments
- Implement strict wireless network access controls and monitoring
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against Qualcomm July 2021 security bulletin; devices with pre-July 2021 firmware are likely vulnerableCheck Version:
Manufacturer-specific commands vary; generally: adb shell getprop ro.build.fingerprint or cat /proc/versionVerify Fix Applied:
Verify firmware version has been updated to post-July 2021 release; check with manufacturer-specific update verification tools📡 Detection & Monitoring
Log Indicators:
- Unexpected system crashes/reboots
- Wi-Fi driver errors
- Memory access violation logs
Network Indicators:
- Unusual beacon frame patterns
- Malformed 802.11 management frames
- Suspicious wireless traffic targeting specific devices
SIEM Query:
wireless AND (beacon OR management_frame) AND (malformed OR oversized OR count_anomaly)