CVE-2021-20606 json
Out-of-bounds Read vulnerability in Mitsubishi Electric GX Works2 versions 1.606G and prior, Mitsubishi Electric MELSOFT Navigator versions…
published 2021-12-17 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8024
- cvss
- 5.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 62%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
cisa ICSA-21-350-05 updated cvss 5.5
Mitsubishi Electric FA Engineering Software (Update B)
-
Mitsubishi Electric EZSocket <= 5.4 Mitsubishi Electric GX Works2 <= 1.606G Mitsubishi Electric MELSOFT Navigator <= 2.84Naffected: vendor fix, mitigation “GX Works2: Version 1.610L or later” mitsubishielectric.com
From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf
Exploit prediction
0.99% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:N/A:P |
Affected products
- n/a Mitsubishi Electric GX Works2; Mitsubishi Electric MELSOFT Navigator; Mitsubishi Electric EZSocket
Classification
- Weakness
-
- CWE-125 Out-of-bounds Read
References
-
mitsubishielectric.com
/en/psirt/vulnerability/pdf/2021-021_en.pdf
patch, vendor-advisory
-
jvn.jp
/vu/JVNVU93817405/index.html
patch, third-party-advisory
-
us-cert.cisa.gov
/ics/advisories/icsa-21-350-05
third-party-advisory, us-government-resource
Sources
- CVE List CVE-2021-20606
- NVD CVE-2021-20606
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