Moxa NPort 6100-G2/NPort 6200-G2 up to 1.0.0 CLI Configuration unnecessary privileges

Summaryinfo

A vulnerability classified as very critical was found in Moxa NPort 6100-G2 and NPort 6200-G2 up to 1.0.0. The affected element is an unknown function of the component CLI Configuration. Executing a manipulation can lead to unnecessary privileges. This vulnerability is handled as CVE-2025-1977. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Moxa NPort 6100-G2 and NPort 6200-G2 up to 1.0.0. It has been declared as very critical. This vulnerability affects an unknown function of the component CLI Configuration. The manipulation with an unknown input leads to a unnecessary privileges vulnerability. The CWE definition for the vulnerability is CWE-250. The product performs an operation at a privilege level that is higher than the minimum level required, which creates new weaknesses or amplifies the consequences of other weaknesses. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The NPort 6100-G2/6200-G2 Series is affected by an execution with unnecessary privileges vulnerability (CVE-2025-1977) that allows an authenticated user with read-only access to perform unauthorized configuration changes through the MCC (Moxa CLI Configuration) tool. The issue can be exploited remotely over the network with low-attack complexity and no user interaction but requires specific system conditions or configurations to be present. Successful exploitation may result in changes to device settings that were not intended to be permitted for the affected user role, potentially leading to a high impact on the confidentiality, integrity, and availability of the device. No impact on other systems has been identified.

The weakness was released by Paxon Sp Lin. The advisory is shared for download at moxa.com. This vulnerability was named CVE-2025-1977 since 03/05/2025. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 01/02/2026). The MITRE ATT&CK project declares the attack technique as T1068.

Upgrading to version 1.1.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at EUVD (EUVD-2025-205902) and CERT Bund (WID-SEC-2026-0002). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Moxa NPort

Productinfo

Type

• Automation Software

Vendor

• Moxa

Name

• NPort 6100-G2
• NPort 6200-G2

Version

• 1.0

License

• commercial

Website

• Vendor: https://www.moxa.com/

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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