HOMEVULNERABILITIESCVE-2020-16850
HIGH

CVE-2020-16850

CWE-20Published: November 30, 2020· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

Mitsubishi MELSEC iQ-R Series PLCs with firmware 49 allow an unauthenticated attacker to halt the industrial process by sending a crafted packet over the network. This denial of service attack exposes Improper Input Validation. After halting, physical access to the PLC is required in order to restore production, and the device state is lost. This is related to R04CPU, RJ71GF11-T2, R04CPU, and RJ71GF11-T2.

NVD Source

Technical Analysis

CVE-2020-16850 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

mitsubishielectric38 product(s)
r00cpu firmwarer00cpur01cpu firmwarer01cpur02cpu firmwarer02cpur04cpu firmwarer04cpur08cpu firmwarer08cpur16cpu firmwarer16cpu+26
Source: NVD CPE · 38 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://blog.scadafence.com/vulnerability-in-mitsubishi-electric-melsec-iq-r-series
ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-20-282-02
ADVISORYhttps://blog.scadafence.com/vulnerability-in-mitsubishi-electric-melsec-iq-r-series
ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-20-282-02

All References (4)

→
https://blog.scadafence.com/vulnerability-in-mitsubishi-electric-melsec-iq-r-seriesThird Party Advisory
→
https://us-cert.cisa.gov/ics/advisories/icsa-20-282-02Third Party Advisory · US Government Resource
→
https://blog.scadafence.com/vulnerability-in-mitsubishi-electric-melsec-iq-r-seriesThird Party Advisory
→
https://us-cert.cisa.gov/ics/advisories/icsa-20-282-02Third Party Advisory · US Government Resource

Quick Facts

CVE IDCVE-2020-16850
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-20
CISA KEVNo
Affected1 vendor(s)
PublishedNov 30, 2020

Related CVEs (CWE-20)

CVE-2007-6176
10.0
CVE-2003-1425
10.0
CVE-2008-1331
10.0
CVE-2008-6826
10.0
CVE-2026-34910
KEV10.0
CVE-2008-6555
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-16850 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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