CVE-2026-85443

Received Received - Intake

Denial of Service in MOOS core-moos via Blocking TCP Handshake

Publication date: 2026-09-03

Last updated on: 2026-09-03

Assigner: VulnCheck

Description

MOOS core-moos through 10.4.0 contains a denial of service vulnerability in MOOSCommServer::ListenLoop() where the accept thread performs a blocking receive without timeout during the wire-protocol handshake. An attacker can open a TCP connection to the MOOSDB port and send no data, causing the accept thread to block indefinitely while holding the socket-list lock, preventing all subsequent client connections.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-03

Last Modified

2026-09-03

Generated

2026-09-04

AI Q&A

2026-09-04

EPSS Evaluated

N/A

NVD

CVE-2026-85443

Affected Vendors & Products

Vendor	Product	Version / Range
moos	core_moos	to 10.4.0 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-400	The product does not properly control the allocation and maintenance of a limited resource.

Attack-Flow Graph

Executive Summary

MOOS core-moos through 10.4.0 has a denial of service vulnerability in the MOOSCommServer::ListenLoop() function. The accept thread blocks indefinitely during the wire-protocol handshake because it performs a blocking receive without a timeout. An attacker can exploit this by opening a TCP connection to the MOOSDB port and sending no data, causing the thread to hold a socket-list lock and preventing new client connections.

Detection Guidance

Check if MOOS core-moos is running and listening on a TCP port. Use netstat or ss to verify active connections to the MOOSDB port. If the accept thread is blocked, the port will remain open but no new connections can be established.

Impact Analysis

This vulnerability can cause your MOOS core-moos system to become unresponsive or crash due to the denial of service. Legitimate users or services trying to connect to the MOOSDB port may be unable to establish connections, disrupting normal operations and potentially leading to system downtime.

Mitigation Strategies

Upgrade MOOS core-moos to a version beyond 10.4.0 where the issue is resolved. If an upgrade is not immediately possible, restrict network access to the MOOSDB port using firewalls or network policies to limit exposure.

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