# CVE-2025-1977: Privilege escalation in NPort 6100-G2/6200-G2 Series

> Authenticated read-only users can perform unauthorized configuration changes on Moxa NPort devices via the MCC tool, compromising device integrity.

- **Severity:** High 7.7 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 31 Dec 2025
- **Updated:** 31 Dec 2025
- **Also known as:** GHSA-x7hg-qr55-cgh5

## What is CVE-2025-1977?

CVE-2025-1977 is a high-severity vulnerability in Moxa NPort 6100-G2/6200-G2 Series, published on 31 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

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.

Weakness: CWE-250 (Execution with Unnecessary Privileges)

## Which versions are affected by CVE-2025-1977?


## How do I fix CVE-2025-1977?

No fix has been published for CVE-2025-1977 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-1977 being exploited?

There is no known exploitation of CVE-2025-1977 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-1977 and fix it if it is affected.

What it is: CVE-2025-1977 is a high-severity vulnerability in Moxa NPort 6100-G2/6200-G2 Series, published on 31 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-1977 in the wild and no public exploit code.

Affected product: Moxa NPort 6100-G2/6200-G2 Series. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-1977/ (Markdown: https://insights.sbomify.com/CVE-2025-1977/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-1977
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-1977
- OSV: https://osv.dev/vulnerability/CVE-2025-1977

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-1977/
Summaries are generated and may contain mistakes; the official description above is the record.