CVE-2020-5668

highpriority · track · 32EPSS 0.049 · 92 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

4.93% (92nd) EPSS

CVSS 7.8 · high

Is it mine?

53 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · cisa_csaf_ot

EPSS · scored 2026-10-27

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

remediations

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

A vendor fix is available.

FixedR00/01/02CPUcisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R08/16/32/120PCPU: firmware Versions 26 or later
FixedR04/08/16/32/120(EN)CPUcisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R08/16/32/120PCPU: firmware Versions 26 or later
FixedR08/16/32/120PCPUcisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R08/16/32/120PCPU: firmware Versions 26 or later
FixedR08/16/32/120PSFCPUcisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R08/16/32/120PCPU: firmware Versions 26 or later
FixedR08/16/32/120SFCPUcisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R08/16/32/120PCPU: firmware Versions 26 or later
FixedRJ71C24(-R2/R4)cisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R08/16/32/120PCPU: firmware Versions 26 or later
FixedRJ71EN71cisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R08/16/32/120PCPU: firmware Versions 26 or later
FixedRJ71GF11-T2cisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R08/16/32/120PCPU: firmware Versions 26 or later
FixedRJ71GN11-T2cisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R08/16/32/120PCPU: firmware Versions 26 or later
FixedRJ71GP21-SXcisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R08/16/32/120PCPU: firmware Versions 26 or later
FixedRJ71GP21S-SXcisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R08/16/32/120PCPU: firmware Versions 26 or later
FixedRJ72GF15-T2cisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R08/16/32/120PCPU: firmware Versions 26 or later
MitigationR00/01/02CPUcisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R00/01/02CPU: firmware Versions 20 or later
MitigationR04/08/16/32/120(EN)CPUcisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R00/01/02CPU: firmware Versions 20 or later
MitigationR08/16/32/120PCPUcisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R00/01/02CPU: firmware Versions 20 or later
MitigationR08/16/32/120PSFCPUcisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R00/01/02CPU: firmware Versions 20 or later
MitigationR08/16/32/120SFCPUcisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R00/01/02CPU: firmware Versions 20 or later
MitigationRJ71C24(-R2/R4)cisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R00/01/02CPU: firmware Versions 20 or later
MitigationRJ71EN71cisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R00/01/02CPU: firmware Versions 20 or later
MitigationRJ71GF11-T2cisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R00/01/02CPU: firmware Versions 20 or later
MitigationRJ71GN11-T2cisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R00/01/02CPU: firmware Versions 20 or later
MitigationRJ71GP21-SXcisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R00/01/02CPU: firmware Versions 20 or later
MitigationRJ71GP21S-SXcisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R00/01/02CPU: firmware Versions 20 or later
MitigationRJ72GF15-T2cisa_csaf_ot
Mitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue: R00/01/02CPU: firmware Versions 20 or later

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 · 6.9–7.8

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

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · 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 (53)

Products and version ranges known to be affected.

R00/01/02CPU: firmware Versions 19 and earlierall versionscisa_csaf_otUS
R04/08/16/32/120(EN)CPU: firmware Versions 51 and earlierall versionscisa_csaf_otUS
R08/16/32/120PCPU: firmware Versions 25 and earlierall versionscisa_csaf_otUS
R08/16/32/120PSFCPU: firmware Versions 06 and earlierall versionscisa_csaf_otUS
R08/16/32/120SFCPU: firmware Versions 22 and earlierall versionscisa_csaf_otUS
RJ71C24(-R2/R4): all versionsall versionscisa_csaf_otUS
RJ71EN71: firmware Versions 47 and earlierall versionscisa_csaf_otUS
RJ71GF11-T2: firmware Versions 47 and earlierall versionscisa_csaf_otUS
RJ71GN11-T2: firmware Versions 11 and earlierall versionscisa_csaf_otUS
RJ71GP21-SX: firmware Versions 47 and earlierall versionscisa_csaf_otUS
RJ71GP21S-SX: firmware Versions 47 and earlierall versionscisa_csaf_otUS
RJ72GF15-T2: firmware Versions 07 and earlierall versionscisa_csaf_otUS
Mitsubishi Electric R00/01/02CPU≤ 19cisa_csaf_otUS
Mitsubishi Electric R04/08/16/32/120(EN)CPU≤ 51cisa_csaf_otUS
Mitsubishi Electric R08/16/32/120PCPU≤ 25cisa_csaf_otUS
Mitsubishi Electric R08/16/32/120PSFCPU≤ 06cisa_csaf_otUS
Mitsubishi Electric R08/16/32/120SFCPU≤ 22cisa_csaf_otUS
Mitsubishi Electric RJ71C24(-R2/R4)all versionscisa_csaf_otUS
Mitsubishi Electric RJ71EN71≤ 47cisa_csaf_otUS
Mitsubishi Electric RJ71GF11-T2≤ 47cisa_csaf_otUS

showing 20 of 53

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-20-324-05Mitsubishi Electric MELSEC iQ-R Series (Update C)2020-11-19icsa · cisa_csaf_otUS
Successful exploitation of this vulnerability could cause a denial-of-service condition for the affected product.

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 CVE.org MITRE

published 2020-11-20modified 2026-06-17

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references (14)

External citations — patches, advisories, analysis.

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