Protocol Vulnerability Detection Method Based on Fuzzing in Low Earth Orbit Satellite Network

Low Earth Orbit (LEO) satellites play a vital role in satellite Internet systems due to their low latency and wide coverage. However, the dynamic topology and limited resources of LEO networks make them vulnerable to protocol-level security threats. Most existing studies focus on network performance or protocol design, with limited attention to protocol vulnerability detection. To address this gap, this paper introduces a protocol detection method for LEO networks based AFLnet (LNAFLnet). To cope with LEO-specific challenges, an adaptive sliding window mechanism is proposed to ensure connection stability while mitigating congestion and routing pollution. Experiments demonstrate that the method improves target selection accuracy, reduces link occupancy and drops average delay compared with existing fuzzing method. We apply the proposed method to a variant of the OSPF protocol designed for LEO networks, and further validate its effectiveness through testing.