CVE-2020-13238

highpriority · track · 31EPSS 0.034 · 89 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

3.42% (89th) EPSS

CVSS 7.8 · high

Is it mine?

34 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-27

Mitsubishi MELSEC iQ-R Series PLCs with firmware 33 allow attackers to halt the industrial process by sending an unauthenticated crafted packet over the network, because this denial of service attack consumes excessive CPU time. After halting, physical access to the PLC is required in order to restore production.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedR00/01/02CPUcisa_csaf_ot
R00/01/02CPU: Firmware Versions 8 or later
FixedR04/08/16/32/120CPU R04/08/16/32/120ENCPUcisa_csaf_ot
R00/01/02CPU: Firmware Versions 8 or later
FixedR08/16/32/120PCPUcisa_csaf_ot
R00/01/02CPU: Firmware Versions 8 or later
FixedR08/16/32/120PSFCPUcisa_csaf_ot
R00/01/02CPU: Firmware Versions 8 or later
FixedR08/16/32/120SFCPUcisa_csaf_ot
R00/01/02CPU: Firmware Versions 8 or later
FixedRJ71EN71cisa_csaf_ot
R00/01/02CPU: Firmware Versions 8 or later
MitigationR00/01/02CPUcisa_csaf_ot
Connection to untrusted networks or hosts: Check whether the modules mounted in the equipment used are connected to untrusted networks or hosts.
MitigationR04/08/16/32/120CPU R04/08/16/32/120ENCPUcisa_csaf_ot
Connection to untrusted networks or hosts: Check whether the modules mounted in the equipment used are connected to untrusted networks or hosts.
MitigationR08/16/32/120PCPUcisa_csaf_ot
Connection to untrusted networks or hosts: Check whether the modules mounted in the equipment used are connected to untrusted networks or hosts.
MitigationR08/16/32/120PSFCPUcisa_csaf_ot
Connection to untrusted networks or hosts: Check whether the modules mounted in the equipment used are connected to untrusted networks or hosts.
MitigationR08/16/32/120SFCPUcisa_csaf_ot
Connection to untrusted networks or hosts: Check whether the modules mounted in the equipment used are connected to untrusted networks or hosts.
MitigationRJ71EN71cisa_csaf_ot
Connection to untrusted networks or hosts: Check whether the modules mounted in the equipment used are connected to untrusted networks or hosts.

cvss

Technical severity, 0–10. One row per scoring source.

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.3–7.8

v2.07.8highAV:N/AC:L/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 10 · impact 6.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.05.3mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · CISA US

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-400USprimaryCWE-400US

affected products (34)

Products and version ranges known to be affected.

R00/01/02CPU: Firmware Versions 7 or earlierall versionscisa_csaf_otUS
R04/08/16/32/120CPU R04/08/16/32/120ENCPU: Firmware Versions 39 or earlierall versionscisa_csaf_otUS
R08/16/32/120PCPU: Firmware Versions 24 or earlierall versionscisa_csaf_otUS
R08/16/32/120PSFCPU: Firmware Versions 05 or earlierall versionscisa_csaf_otUS
R08/16/32/120SFCPU: Firmware Versions 20 or earlierall versionscisa_csaf_otUS
RJ71EN71: Firmwar Versions 49 or earlierall versionscisa_csaf_otUS
Mitsubishi Electric R00/01/02CPU≤ 7cisa_csaf_otUS
Mitsubishi Electric R04/08/16/32/120CPU R04/08/16/32/120ENCPU≤ 39cisa_csaf_otUS
Mitsubishi Electric R08/16/32/120PCPU≤ 24cisa_csaf_otUS
Mitsubishi Electric R08/16/32/120PSFCPU≤ 05cisa_csaf_otUS
Mitsubishi Electric R08/16/32/120SFCPU≤ 20cisa_csaf_otUS
Mitsubishi Electric RJ71EN71≤ 49cisa_csaf_otUS
n/a n/a≤ n/aenisa_euvdEU
mitsubishielectric melsec iq-r00cpu firmware≤ 7nvdUScpe:2.3:o:mitsubishielectric:melsec_iq-r00cpu_firmware:*:*:*:*:*:*:*:*
mitsubishielectric melsec iq-r01cpu firmware≤ 7nvdUScpe:2.3:o:mitsubishielectric:melsec_iq-r01cpu_firmware:*:*:*:*:*:*:*:*
mitsubishielectric melsec iq-r02cpu firmware≤ 7nvdUScpe:2.3:o:mitsubishielectric:melsec_iq-r02cpu_firmware:*:*:*:*:*:*:*:*
mitsubishielectric melsec iq-r04cpu firmware≤ 39nvdUScpe:2.3:o:mitsubishielectric:melsec_iq-r04cpu_firmware:*:*:*:*:*:*:*:*
mitsubishielectric melsec iq-r08cpu firmware≤ 39nvdUScpe:2.3:o:mitsubishielectric:melsec_iq-r08cpu_firmware:*:*:*:*:*:*:*:*
mitsubishielectric melsec iq-r08fcpu firmware≤ 20nvdUScpe:2.3:o:mitsubishielectric:melsec_iq-r08fcpu_firmware:*:*:*:*:*:*:*:*
mitsubishielectric melsec iq-r08pcpu firmwareall versionsnvdUScpe:2.3:o:mitsubishielectric:melsec_iq-r08pcpu_firmware:*:*:*:*:*:*:*:*

showing 20 of 34

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-20-161-02Mitsubishi Electric MELSEC iQ-R Series (Update C)2020-06-09icsa · cisa_csaf_otUS
Successful exploitation of this vulnerability could cause the Ethernet port to enter a denial-of-service condition.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cisa_csaf_ot nvd NVD CVE.org MITRE

published 2020-06-10modified 2026-06-17

related (9,618)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2026-28318US	—OT critical	43.7% (99th)	KEV	2026-06-04
SolarWinds Serv-U is susceptible to specially crafted POST requests that crash the Serv-U service without authentication using Content-Encoding: deflate. Mitigation steps are provi…
CVE-2026-45498US	high7.5OT critical	63.1% (99th)	KEV	2026-05-20
Microsoft Defender Denial of Service Vulnerability
CVE-2023-44487US	high7.5OT critical	100.0% (100th)	KEV	2023-10-10
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through…
CVE-2023-38180US	—OT critical	14.1% (97th)	KEV	2023-08-08
.NET and Visual Studio Denial of Service Vulnerability
CVE-2021-44228US	critical10.0OT critical	100.0% (100th)	KEV	2021-12-10
Apache Log4j2 2.0-beta9 through 2.15.0 (excluding security releases 2.12.2, 2.12.3, and 2.3.1) JNDI features used in configuration, log messages, and parameters do not protect agai…

+9613 more

references (12)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan