Vulnerability · Published Nov 29, 2025 · Assigned by GitHub_M
CVE-2025-66217AIS-catcher Integer Underflow in MQTT Packet Parsing leading to Heap Buffer Overflow
High 8.8
In plain English
A high-severity heap buffer overflow in AIS-catcher from jvde-github. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| jvde-github | AIS-catcher | < 0.64 |
Weakness: CWE-122, CWE-191 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N