CVE-2026-10831

Improper Authorization of Break Signal Commands in Devices

Published Jun 16, 2026 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Description
A denial-of-service vulnerability exists in NPort devices because of improper access control on the command port. The command interface does not properly validate whether a sender is associated with a valid data port session before accepting break signal commands. A remote attacker with network access can send crafted requests to disrupt serial communication for an active user session.

Remediation

Vendor Solution

Please refer to the security advisory: https://www.moxa.com/en/support/product-support/security-advisory/mpsa-262370-cve-2026-10831-improper-authorization-vulnerability-in-serial-device-servers

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Moxa
Moxa cn2600 Series
Moxa nport 5600 Series
Vendors & Products Moxa
Moxa cn2600 Series
Moxa nport 5600 Series
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description A denial-of-service vulnerability exists in NPort devices because of improper access control on the command port. The command interface does not properly validate whether a sender is associated with a valid data port session before accepting break signal commands. A remote attacker with network access can send crafted requests to disrupt serial communication for an active user session.
Title Improper Authorization of Break Signal Commands in Devices
Weaknesses CWE-862
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Moxa
Published
Updated
Jun 16, 2026, 3:27 PM
Reserved
Jun 4, 2026, 10:11 AM
Status
Awaiting Analysis
Published
Jun 16, 2026, 3:16 PM
Modified
Jun 17, 2026, 10:12 AM