CVE-2021-0507
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Android devices via Bluetooth without user interaction. It affects Android versions 8.1 through 11 due to an out-of-bounds write in the Bluetooth stack. Attackers within Bluetooth range can potentially take full control of vulnerable devices.
💻 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 compromise, data theft, surveillance, or device bricking.
Likely Case
Remote code execution allowing installation of malware, data exfiltration, or device takeover by nearby attackers.
If Mitigated
No impact if patched or Bluetooth disabled; limited impact if Bluetooth range restrictions apply.
🎯 Exploit Status
Exploitation requires Bluetooth proximity and knowledge of the vulnerability, but no authentication or user interaction.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Patch Level June 2021 or later
Vendor Advisory: https://source.android.com/security/bulletin/2021-06-01
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System > Advanced > System update. 2. Install Android Security Patch Level June 2021 or later. 3. Reboot device after installation.
🔧 Temporary Workarounds
Disable Bluetooth
androidTurn off Bluetooth to prevent remote exploitation via this vector.
Settings > Connected devices > Connection preferences > Bluetooth > Toggle off
Restrict Bluetooth Visibility
androidSet Bluetooth to non-discoverable mode to reduce attack surface.
Settings > Connected devices > Connection preferences > Bluetooth > Device name > Turn off 'Make device visible'
🧯 If You Can't Patch
- Disable Bluetooth when not in use, especially in public or untrusted environments.
- Use device in areas with controlled physical access to limit Bluetooth range exposure.
🔍 How to Verify
Check if Vulnerable:
Check Android version and security patch level in Settings > About phone > Android version and Security patch level.Check Version:
Settings > About phone > Android versionVerify Fix Applied:
Verify Security patch level is June 2021 or later in Settings > About phone > Security patch level.📡 Detection & Monitoring
Log Indicators:
- Unusual Bluetooth connection attempts, crashes in Bluetooth stack (btif_rc)
Network Indicators:
- Suspicious Bluetooth traffic patterns, unexpected Bluetooth pairing requests
SIEM Query:
Not typically applicable for mobile device Bluetooth attacks in enterprise SIEMs.