CVE-2022-20127
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on affected Android devices without user interaction. The flaw exists in the NFC stack where a double free condition enables out-of-bounds write, potentially leading to full device compromise. All Android devices running versions 10 through 12L are affected.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device takeover, data theft, persistent backdoor installation, and lateral movement within networks.
Likely Case
Device compromise leading to data exfiltration, surveillance capabilities, or ransomware deployment on vulnerable devices.
If Mitigated
No impact if patched; unpatched devices remain vulnerable to remote exploitation without user interaction.
🎯 Exploit Status
Requires NFC proximity or malicious NFC tag/device; no user interaction needed for exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Patch Level 2022-06-01 or later
Vendor Advisory: https://source.android.com/security/bulletin/2022-06-01
Restart Required: Yes
Instructions:
1. Check current patch level in Settings > About phone > Android version > Android security update. 2. Install June 2022 or later security patch via Settings > System > System update. 3. Reboot device after update completes.
🔧 Temporary Workarounds
Disable NFC
androidTemporarily disable NFC functionality to prevent exploitation via malicious tags or devices.
adb shell settings put secure nfc_on 0
Settings > Connected devices > Connection preferences > NFC > Toggle off
🧯 If You Can't Patch
- Disable NFC functionality completely on all affected devices.
- Implement network segmentation to isolate vulnerable devices from critical systems.
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level: Settings > About phone > Android version > Android security update. If date is before June 2022, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level shows June 2022 or later. Confirm NFC functions normally after re-enabling.📡 Detection & Monitoring
Log Indicators:
- NFC service crashes in logcat
- Unexpected NFC tag interactions
- Process memory corruption errors
Network Indicators:
- Unusual NFC communication patterns
- Unexpected Bluetooth/WiFi connections following NFC events
SIEM Query:
source="android_logs" AND ("NFC" AND ("crash" OR "corruption" OR "double free"))