CVE-2021-20591

highPriorität · verfolgen · 31EPSS 0.015 · 74. PerzentilEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.50% (74th) EPSS

CVSS 7.8 · high

Is it mine?

31 products

Prüfe deine Angriffsfläche

Who says so?

4 sources

cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · bewertet 2026-10-27

Uncontrolled Resource Consumption vulnerability in Mitsubishi Electric MELSEC iQ-R series CPU modules (R00/01/02CPU all versions, R04/08/16/32/120(EN)CPU all versions, R08/16/32/120SFCPU all versions, R08/16/32/120PCPU all versions, R08/16/32/120PSFCPU all versions) allows a remote unauthenticated attacker to prevent legitimate clients from connecting to the MELSOFT transmission port (TCP/IP) by not closing a connection properly, which may lead to a denial of service (DoS) condition.

Behebungen

Hersteller-Fix, Mitigation oder Workaround, wie von den Quellen veröffentlicht.

Noch kein Hersteller-Fix; eine Mitigation ist verfügbar.

MitigationR00/01/02CPUcisa_csaf_ot
If Port 5007 of the MELSOFT transmission port (TCP/IP) is not used, set b2 to "1" in advance. See MELSEC iQ-R Ethernet User's Manual (Application) Appendix 3, Buffer Memory for more information.
MitigationR04/08/16/32/120(EN)CPUcisa_csaf_ot
If Port 5007 of the MELSOFT transmission port (TCP/IP) is not used, set b2 to "1" in advance. See MELSEC iQ-R Ethernet User's Manual (Application) Appendix 3, Buffer Memory for more information.
MitigationR08/16/32/120PCPUcisa_csaf_ot
If Port 5007 of the MELSOFT transmission port (TCP/IP) is not used, set b2 to "1" in advance. See MELSEC iQ-R Ethernet User's Manual (Application) Appendix 3, Buffer Memory for more information.
MitigationR08/16/32/120PSFCPUcisa_csaf_ot
If Port 5007 of the MELSOFT transmission port (TCP/IP) is not used, set b2 to "1" in advance. See MELSEC iQ-R Ethernet User's Manual (Application) Appendix 3, Buffer Memory for more information.
MitigationR08/16/32/120SFCPUcisa_csaf_ot
If Port 5007 of the MELSOFT transmission port (TCP/IP) is not used, set b2 to "1" in advance. See MELSEC iQ-R Ethernet User's Manual (Application) Appendix 3, Buffer Memory for more information.

cvss

Technischer Schweregrad, 0–10. Eine Zeile je Quelle.

7.8

010

Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen⚠ Quellen uneinig · medium–high · 5.3–7.8

v2.07.8highAV:N/AC:L/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USAusnutzbarkeit 10 · Auswirkung 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 USAusnutzbarkeit 3.9 · Auswirkung 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)

schwächen

Die CWE-Schwächeklassen, zu denen dies gehört.

CWE-400USprimärCWE-400US

betroffene Produkte (31)

Betroffene Produkte und Versionsbereiche.

R00/01/02CPU: All versionsalle Versionencisa_csaf_otUS
R04/08/16/32/120(EN)CPU: All versionsalle Versionencisa_csaf_otUS
R08/16/32/120PCPU: All versionsalle Versionencisa_csaf_otUS
R08/16/32/120PSFCPU: All versionsalle Versionencisa_csaf_otUS
R08/16/32/120SFCPU: All versionsalle Versionencisa_csaf_otUS
Mitsubishi Electric R00/01/02CPUalle Versionencisa_csaf_otUS
Mitsubishi Electric R04/08/16/32/120(EN)CPUalle Versionencisa_csaf_otUS
Mitsubishi Electric R08/16/32/120PCPUalle Versionencisa_csaf_otUS
Mitsubishi Electric R08/16/32/120PSFCPUalle Versionencisa_csaf_otUS
Mitsubishi Electric R08/16/32/120SFCPUalle Versionencisa_csaf_otUS
n/a MELSEC iQ-R Series CPU Modules≤ R00/01/02CPU all versions, R04/08/16/32/120(EN)CPU all versions, R08/16/32/120SFCPU all versions, R08/16/32/120PCPU all versions, R08/16/32/120PSFCPU all versionsenisa_euvdEU
mitsubishielectric r00cpu firmwarealle VersionennvdUScpe:2.3:o:mitsubishielectric:r00cpu_firmware:*:*:*:*:*:*:*:*
mitsubishielectric r01cpu firmwarealle VersionennvdUScpe:2.3:o:mitsubishielectric:r01cpu_firmware:*:*:*:*:*:*:*:*
mitsubishielectric r02cpu firmwarealle VersionennvdUScpe:2.3:o:mitsubishielectric:r02cpu_firmware:*:*:*:*:*:*:*:*
mitsubishielectric r04cpu firmwarealle VersionennvdUScpe:2.3:o:mitsubishielectric:r04cpu_firmware:*:*:*:*:*:*:*:*
mitsubishielectric r08cpu firmwarealle VersionennvdUScpe:2.3:o:mitsubishielectric:r08cpu_firmware:*:*:*:*:*:*:*:*
mitsubishielectric r08pcpu firmwarealle VersionennvdUScpe:2.3:o:mitsubishielectric:r08pcpu_firmware:*:*:*:*:*:*:*:*
mitsubishielectric r08psfcpu firmwarealle VersionennvdUScpe:2.3:o:mitsubishielectric:r08psfcpu_firmware:*:*:*:*:*:*:*:*
mitsubishielectric r08sfcpu firmwarealle VersionennvdUScpe:2.3:o:mitsubishielectric:r08sfcpu_firmware:*:*:*:*:*:*:*:*
mitsubishielectric r120cpu firmwarealle VersionennvdUScpe:2.3:o:mitsubishielectric:r120cpu_firmware:*:*:*:*:*:*:*:*

20 von 31 angezeigt

Advisories (1)

Hersteller- und Ökosystem-Meldungen dazu.

ICSA-21-147-05Mitsubishi Electric MELSEC iQ-R Series2021-05-27icsa · cisa_csaf_otUS
Successful exploitation of this vulnerability may prevent legitimate clients from connecting to an affected product.

auch bekannt als (3)

Weitere Namen und Kennungen dieser Entität.

quellen

Welche Quellen diesen Datensatz belegen und wann.

cnnvd enisa_euvd cisa_csaf_ot nvd NVD CVE.org MITRE

veröffentlicht 2021-06-11geändert 2026-06-17

verwandt (9,618)

Verwandte Einträge.

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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…
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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 weitere

Referenzen (10)

Externe Belege — Patches, Meldungen, Analysen.

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