HOMEVULNERABILITIESCVE-2021-20608
HIGH

CVE-2021-20608

NVD-CWE-OtherPublished: December 17, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

Improper Handling of Length Parameter Inconsistency vulnerability in Mitsubishi Electric GX Works2 versions 1.606G and prior allows a remote unauthenticated attacker to cause a DoS condition in GX Works2 by getting GX Works2 to read a tampered program file from a Mitsubishi Electric PLC by sending malicious crafted packets to tamper with the program file.

NVD Source

Technical Analysis

CVE-2021-20608 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

mitsubishielectric1 product(s)
gx works2
Source: NVD CPE · 1 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

ADVISORYhttps://jvn.jp/vu/JVNVU93019896/index.html
ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-21-350-04
ADVISORYhttps://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-020_en.pdf
ADVISORYhttps://jvn.jp/vu/JVNVU93019896/index.html
ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-21-350-04
ADVISORYhttps://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-020_en.pdf

All References (6)

→
https://jvn.jp/vu/JVNVU93019896/index.htmlThird Party Advisory
→
https://us-cert.cisa.gov/ics/advisories/icsa-21-350-04Third Party Advisory · US Government Resource
→
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-020_en.pdfVendor Advisory
→
https://jvn.jp/vu/JVNVU93019896/index.htmlThird Party Advisory
→
https://us-cert.cisa.gov/ics/advisories/icsa-21-350-04Third Party Advisory · US Government Resource
→
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-020_en.pdfVendor Advisory

Quick Facts

CVE IDCVE-2021-20608
CVSS Score7.5 / 10
SeverityHIGH
WeaknessNVD-CWE-Other
CISA KEVNo
Affected1 vendor(s)
PublishedDec 17, 2021

Related CVEs (NVD-CWE-Other)

CVE-1999-0834
10.0
CVE-2004-0557
10.0
CVE-2003-1140
10.0
CVE-2004-0318
10.0
CVE-1999-0192
10.0
CVE-2004-0524
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-20608 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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