CVE-2025-66217: AIS-catcher is a multi-platform AIS receiver

Q: How do I fix CVE-2025-66217?

ais-catcher: upgrade to 0.64. Exact commands for each OS are on this page.

Q: Is CVE-2025-66217 being exploited?

CVE-2025-66217 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-66217 affect?

CVE-2025-66217 affects ais-catcher. Severity is high (CVSS 7.5). 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 send

Q: How urgent is CVE-2025-66217?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2025-66217 is a high-severity flaw (CVSS 7.5) affecting ais-catcher. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-122, CWE-191
Published	2025-11-29
Last modified	2026-10-07

Publisher (CNA): GitHub, Inc. · Vendor: aiscatcher

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-29 03:15 UTCPublished CVE record published
2026-10-07 20:10 UTCUpdated Record last modified

aiscatcher ais-catcher UPGRADE

Affected: < 0.64

Fixed in: 0.64

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ais-catcher || rpm -q ais-catcher || ais-catcher --version

2. UPGRADE to 0.64 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ais-catcher

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ais-catcher

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-66217?

ais-catcher: upgrade to 0.64. Exact commands for each OS are on this page.

Is CVE-2025-66217 being exploited?

CVE-2025-66217 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-66217 affect?

CVE-2025-66217 affects ais-catcher. Severity is high (CVSS 7.5). 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 send

How urgent is CVE-2025-66217?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-66216 CRITICAL 9.8 UPGRADE AIS-catcher is a multi-platform AIS receiver

References

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