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Vulnerability record · CVE-2021-20606 · published 17 December 2021

CVE-2021-20606: Mitsubishielectric ezsocket out-of-bounds read vulnerability

Mitsubishielectric · Ezsocket

Out-of-bounds Read vulnerability in Mitsubishi Electric GX Works2 versions 1.606G and prior, Mitsubishi Electric MELSOFT Navigator versions 2.84N and prior and Mitsubishi Electric EZSocket versions 5.4 and prior allows an attacker to cause a DoS condition in the software by getting a user to open malicious project file specially crafted by an attacker.

5.5 CVSS 3.1 Medium EPSS 0.99% · top 38.5% CWE-125 · Out-of-bounds read
5.5CVSS 3.1 base score, v2 4.3
0.99%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

Out-of-bounds Read vulnerability in Mitsubishi Electric GX Works2 versions 1.606G and prior, Mitsubishi Electric MELSOFT Navigator versions 2.84N and prior and Mitsubishi Electric EZSocket versions 5.4 and prior allows an attacker to cause a DoS condition in the software by getting a user to open malicious project file specially crafted by an attacker.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://jvn.jp/vu/JVNVU93817405/index.html PatchThird Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-350-05 Third Party AdvisoryUS Government Resource
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-021_en.pdf PatchVendor Advisory
https://jvn.jp/vu/JVNVU93817405/index.html PatchThird Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-350-05 Third Party AdvisoryUS Government Resource
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-021_en.pdf PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-20606), CISA KEV, FIRST EPSS (scores of 2026-10-12). This page is refreshed as NVD updates the record.