HOMEVULNERABILITIESCVE-2020-5546
HIGH

CVE-2020-5546

CWE-88Published: March 16, 2020· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') vulnerability in TCP function included in the firmware of Mitsubishi Electric MELQIC IU1 series IU1-1M20-D firmware version 1.0.7 and earlier allows an attacker on the same network segment to stop the network functions or execute malware via a specially crafted packet.

NVD Source

Technical Analysis

CVE-2020-5546 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

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 complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

mitsubishielectric2 product(s)
iu1-1m20-d firmwareiu1-1m20-d
Source: NVD CPE · 2 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://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2019-004.pdf
PATCHhttps://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2019-004.pdf
ADVISORYhttps://jvn.jp/en/vu/JVNVU92370624/index.html
ADVISORYhttps://jvn.jp/en/vu/JVNVU92370624/index.html

All References (4)

→
https://jvn.jp/en/vu/JVNVU92370624/index.htmlThird Party Advisory
→
https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2019-004.pdfPatch · Vendor Advisory
→
https://jvn.jp/en/vu/JVNVU92370624/index.htmlThird Party Advisory
→
https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2019-004.pdfPatch · Vendor Advisory

Quick Facts

CVE IDCVE-2020-5546
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-88
CISA KEVNo
Affected1 vendor(s)
PublishedMar 16, 2020

Related CVEs (CWE-88)

CVE-1999-0113
10.0
CVE-2004-0480
10.0
CVE-2026-57572
10.0
CVE-2007-0882
10.0
CVE-2018-3856
9.9
CVE-2024-47553
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-5546 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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