CVE-2025-66217 AIS-catcher Integer Underflow in MQTT Packet Parsing leading to Heap Buffer Overflow
Attackers can cause denial of service or remote code execution in AIS-catcher by sending malformed MQTT packets that trigger an integer underflow and heap buffer overflow.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-66217?
CVE-2025-66217 is a high-severity vulnerability in jvde-github AIS-catcher, published on 29 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Which versions are affected by CVE-2025-66217?
It affects 1 product.
Products include Aiscatcher Ais-Catcher.
How do I fix CVE-2025-66217?
No fix has been published for CVE-2025-66217 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-66217 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66217 exists.
Other vulnerabilities in jvde-github AIS-catcher
Sources
Also known as GHSA-93mj-c8q3-69rg.