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PatchSiren cyber security CVE debrief

CVE-2026-10831 Moxa CVE debrief

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.

Vendor
Moxa
Product
NPort 6000 Series
CVSS
MEDIUM 6.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-16
Original CVE updated
2026-06-16
Advisory published
2026-06-16
Advisory updated
2026-06-16

Who should care

Users of Moxa NPort devices should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability has a CVSS score of 6.9 and is classified as MEDIUM severity. It is caused by improper access control on the command port, allowing remote attackers to disrupt serial communication.

Defensive priority

MEDIUM

Recommended defensive actions

  • Apply patches or updates provided by the vendor (see resourceLinkAnnotations 'ref-4')
  • Restrict access to the command port
  • Monitor network activity for suspicious requests

Evidence notes

The vendor is likely Moxa (see evidence in vendor section)

Sources and references

Verified primary and authoritative sources

  • CVE-2026-10831 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-10831

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-10831 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-10831

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

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

    [email protected]

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.