HOMEVULNERABILITIESCVE-2020-5527
HIGH

CVE-2020-5527

CWE-400Published: March 30, 2020· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC Q series (all versions), MELSEC L series (all versions), and MELSEC F series (all versions) receives massive amount of data via unspecified vectors, resource consumption occurs and the port does not process the data properly. As a result, it may fall into a denial-of-service (DoS) condition. The vendor states this vulnerability only affects Ethernet communication functions.

NVD Source

Technical Analysis

CVE-2020-5527 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

mitsubishielectric92 product(s)
cr800-q firmwarecr800-qfx3g firmwarefx3gfx3gc firmwarefx3gcfx3s firmwarefx3sfx3u firmwarefx3ufx3uc firmwarefx3uc+80
Source: NVD CPE · 92 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/en/vu/JVNVU91553662/index.html
ADVISORYhttps://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2019-005_en.pdf
ADVISORYhttps://jvn.jp/en/vu/JVNVU91553662/index.html
ADVISORYhttps://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2019-005_en.pdf

All References (4)

→
https://jvn.jp/en/vu/JVNVU91553662/index.htmlThird Party Advisory
→
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2019-005_en.pdfVendor Advisory
→
https://jvn.jp/en/vu/JVNVU91553662/index.htmlThird Party Advisory
→
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2019-005_en.pdfVendor Advisory

Quick Facts

CVE IDCVE-2020-5527
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-400
CISA KEVNo
Affected1 vendor(s)
PublishedMar 30, 2020

Related CVEs (CWE-400)

CVE-2023-30769
9.8
CVE-2022-48716
9.8
CVE-2013-20004
9.8
CVE-2023-28507
9.8
CVE-2024-36543
9.8
CVE-2024-39462
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-5527 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.
← All Vulnerabilities·Search for CVE-2020-5527·NVD