CVE-2022-40265 — Improper Input Validation vulnerability in Mitsubishi Electric Corporation MELSE

Improper Input Validation vulnerability in Mitsubishi Electric Corporation MELSEC iQ-R Series RJ71EN71 Firmware version "65" and prior and Mitsubishi Electric Corporation MELSEC iQ-R Series R04/08/16/32/120ENCPU Network Part Firmware version "65" and prior all

01What is this vulnerability?

Improper Input Validation vulnerability in Mitsubishi Electric Corporation MELSEC iQ-R Series RJ71EN71 Firmware version "65" and prior and Mitsubishi Electric Corporation MELSEC iQ-R Series R04/08/16/32/120ENCPU Network Part Firmware version "65" and prior allows a remote unauthenticated attacker to cause a Denial of Service condition by sending specially crafted packets. A system reset is…

02Affected products

Vendor	Product	Versions
Mitsubishi Electric Corporation	MELSEC iQ	R Series RJ71EN71 — Firmware version "65" and prior
Mitsubishi Electric Corporation	MELSEC iQ	R Series R04/08/16/32/120ENCPU — Network Part Firmware version "65" and prior

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-11-30T00:04:43.069Z
• Last modified: 2025-04-24T18:45:03.895Z

09References

• www.mitsubishielectric.com — https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2022-017_en.pdf
• jvn.jp — https://jvn.jp/vu/JVNVU94702422