HOME VULNERABILITIESCVE-2020-5668

HIGH

CVE-2020-5668

CWE-400Published: November 20, 2020· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

Uncontrolled resource consumption vulnerability in MELSEC iQ-R Series modules (R00/01/02CPU firmware version '19' and earlier, R04/08/16/32/120 (EN) CPU firmware version '51' and earlier, R08/16/32/120SFCPU firmware version '22' and earlier, R08/16/32/120PCPU firmware version '25' and earlier, R08/16/32/120PSFCPU firmware version '06' and earlier, RJ71EN71 firmware version '47' and earlier, RJ71GF11-T2 firmware version '47' and earlier, RJ72GF15-T2 firmware version '07' and earlier, RJ71GP21-SX firmware version '47' and earlier, RJ71GP21S-SX firmware version '47' and earlier, and RJ71GN11-T2 firmware version '11' and earlier) allows a remote unauthenticated attacker to cause an error in a CPU unit and cause a denial-of-service (DoS) condition in execution of the program and its communication, or to cause a denial-of-service (DoS) condition in communication via the unit by receiving a specially crafted SLMP packet

Technical Analysis

CVE-2020-5668 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

mitsubishielectric56 product(s)

r00cpu firmwarer00cpur01cpu firmwarer01cpur02cpu firmwarer02cpur04cpu firmwarer04cpur08cpu firmwarer08cpur16cpu firmwarer16cpu+44

Source: NVD CPE · 56 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

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/JVNVU95980140/index.html

ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-20-324-05

ADVISORYhttps://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-016.pdf

ADVISORYhttps://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-016_en.pdf

ADVISORYhttps://jvn.jp/vu/JVNVU95980140/index.html

ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-20-324-05

ADVISORYhttps://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-016.pdf

ADVISORYhttps://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-016_en.pdf

All References (8)

→

https://jvn.jp/vu/JVNVU95980140/index.htmlThird Party Advisory

→

https://us-cert.cisa.gov/ics/advisories/icsa-20-324-05Third Party Advisory · US Government Resource

→

https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-016.pdfVendor Advisory

→

https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-016_en.pdfVendor Advisory

→

https://jvn.jp/vu/JVNVU95980140/index.htmlThird Party Advisory

→

https://us-cert.cisa.gov/ics/advisories/icsa-20-324-05Third Party Advisory · US Government Resource

→

https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-016.pdfVendor Advisory

→

https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-016_en.pdfVendor Advisory

Quick Facts

CVE IDCVE-2020-5668

CVSS Score7.5 / 10

SeverityHIGH

WeaknessCWE-400

CISA KEVNo

Affected1 vendor(s)

PublishedNov 20, 2020

Related CVEs (CWE-400)

CVE-2017-1000378

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2020-5668 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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