HOMEVULNERABILITIESCVE-2021-20606
MEDIUM

CVE-2021-20606

CWE-125Published: December 17, 2021· Updated: Jun 17, 2026

5.5
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-20606 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected Vendors & Products

mitsubishielectric3 product(s)
ezsocketgx works2melsoft navigator
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://jvn.jp/vu/JVNVU93817405/index.html
PATCHhttps://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-021_en.pdf
PATCHhttps://jvn.jp/vu/JVNVU93817405/index.html
PATCHhttps://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-021_en.pdf
ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-21-350-05
ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-21-350-05

All References (6)

→
https://jvn.jp/vu/JVNVU93817405/index.htmlPatch · Third Party Advisory
→
https://us-cert.cisa.gov/ics/advisories/icsa-21-350-05Third Party Advisory · US Government Resource
→
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-021_en.pdfPatch · Vendor Advisory
→
https://jvn.jp/vu/JVNVU93817405/index.htmlPatch · Third Party Advisory
→
https://us-cert.cisa.gov/ics/advisories/icsa-21-350-05Third Party Advisory · US Government Resource
→
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-021_en.pdfPatch · Vendor Advisory

Quick Facts

CVE IDCVE-2021-20606
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-125
CISA KEVNo
Affected1 vendor(s)
PublishedDec 17, 2021

Related CVEs (CWE-125)

CVE-2021-21777
10.0
CVE-2009-2523
10.0
CVE-2021-41556
10.0
CVE-2013-0767
10.0
CVE-2017-14451
10.0
CVE-2023-26489
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-20606 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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