HOMEVULNERABILITIESCVE-2021-20601
HIGH

CVE-2021-20601

CWE-20Published: November 23, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

Improper input validation vulnerability in GOT2000 series GT27 model all versions, GOT2000 series GT25 model all versions, GOT2000 series GT23 model all versions, GOT2000 series GT21 model all versions, GOT SIMPLE series GS21 model all versions, and GT SoftGOT2000 all versions allows an remote unauthenticated attacker to write a value that exceeds the configured input range limit by sending a malicious packet to rewrite the device value. As a result, the system operation may be affected, such as malfunction.

NVD Source

Technical Analysis

CVE-2021-20601 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 full integrity compromise (data manipulation), 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
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected Vendors & Products

mitsubishielectric99 product(s)
gt softgot2000got simple gs2110-wtbd firmwaregot simple gs2110-wtbdgot simple gs2107-wtbd firmwaregot simple gs2107-wtbdgot2000 gt2104-rtbd firmwaregot2000 gt2104-rtbdgot2000 gt2103-pmbd firmwaregot2000 gt2103-pmbdgot2000 gt2103-pmbds firmwaregot2000 gt2103-pmbdsgot2000 gt2103-pmbds2 firmware+87
Source: NVD CPE · 99 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/JVNVU98072504
ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-21-320-02
ADVISORYhttps://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2021-018.pdf
ADVISORYhttps://jvn.jp/vu/JVNVU98072504
ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-21-320-02
ADVISORYhttps://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2021-018.pdf

All References (6)

→
https://jvn.jp/vu/JVNVU98072504Third Party Advisory
→
https://us-cert.cisa.gov/ics/advisories/icsa-21-320-02Third Party Advisory · US Government Resource
→
https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2021-018.pdfVendor Advisory
→
https://jvn.jp/vu/JVNVU98072504Third Party Advisory
→
https://us-cert.cisa.gov/ics/advisories/icsa-21-320-02Third Party Advisory · US Government Resource
→
https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2021-018.pdfVendor Advisory

Quick Facts

CVE IDCVE-2021-20601
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-20
CISA KEVNo
Affected1 vendor(s)
PublishedNov 23, 2021

Related CVEs (CWE-20)

CVE-2007-4915
10.0
CVE-2009-0545
10.0
CVE-2003-1425
10.0
CVE-2024-22476
10.0
CVE-2008-6555
10.0
CVE-2011-1018
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-20601 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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