CVE-2025-66217 – AIS-catcher Integer Underflow in MQTT Packet Parsing leading to Heap Buffer Overflow

CVE ID : CVE-2025-66217

Published : Nov. 29, 2025, 3:15 a.m. | 1 hour, 8 minutes ago

Description : AIS-catcher is a multi-platform AIS receiver. Prior to version 0.64, an integer underflow vulnerability exists in the MQTT parsing logic of AIS-catcher. This vulnerability allows an attacker to trigger a massive Heap Buffer Overflow by sending a malformed MQTT packet with a manipulated Topic Length field. This leads to an immediate Denial of Service (DoS) and, when used as a library, severe Memory Corruption that can be leveraged for Remote Code Execution (RCE). This issue has been patched in version 0.64.

Severity: 8.8 | HIGH

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