# satellite_sim.py - Spacecraft that executes telecommands without checking sequence number
class Satellite:
    def __init__(self):
        self.executed = set()
    def receive_tc(self, cmd_id, seq_num):
        # Vulnerability: ignores seq_num, allowing replay of same command
        self.execute(cmd_id)

def execute(cmd_id):
    print(f"Executing command {cmd_id}")

sat = Satellite()
# Legitimate command
sat.receive_tc("ORBIT_CORRECTION", 1001)
# Attacker replays the same command
sat.receive_tc("ORBIT_CORRECTION", 1001)