CVE-2021-20586

HIGHNVD 7.57.5—

7.5

Resource management errors vulnerability in a robot controller of MELFA FR Series(controller "CR800-*V*D" of RV-*FR*-D-* all versions, controller "CR800-*HD" of RH-*FRH*-D-* all versions, controller "CR800-*HRD" of RH-*FRHR*-D-* all versions, controller "CR800-*V*R with R16RTCPU" of RV-*FR*-R-* all versions, controller "CR800-*HR with R16RTCPU" of RH-*FRH*-R-* all versions, controller "CR800-*HRR with R16RTCPU" of RH-*FRHR*-R-* all versions, controller "CR800-*V*Q with Q172DSRCPU" of RV-*FR*-Q-* all versions, controller "CR800-*HQ with Q172DSRCPU" of RH-*FRH*-Q-* all versions, controller "CR800-*HRQ with Q172DSRCPU" of RH-*FRHR*-Q-* all versions) and a robot controller of MELFA CR Series(controller "CR800-CVD" of RV-8CRL-D-* all versions, controller "CR800-CHD" of RH-*CRH-D-* all versions) as well as a cooperative robot ASSISTA(controller "CR800-05VD" of RV-5AS-D-* all versions) allows a remote unauthenticated attacker to cause a DoS of the execution of the robot program and the Ethernet communication by sending a large amount of packets in burst over a short period of time. As a result of DoS, an error may occur. A reset is required to recover it if the error occurs.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 84.0%
KEV: Not listed

Published

January 29, 2021

Last Modified

November 21, 2024

References (2)

Mitsubishielectrichttps://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-019_en.pdf
af854a3a-2127-422b-91ae-364da2661108https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-019_en.pdf

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-400Uncontrolled Resource Consumption (Denial of Service)

Data Freshness Timeline

(refreshed 10× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 13:10 UTCepss_batch
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2026-06-01 13:50 UTCepss_batch
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2026-05-29 13:42 UTCepss_batch
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2026-05-27 13:39 UTCepss_batch
2026-05-26 21:30 UTCEG score recompute
2026-05-26 21:30 UTCGHSA enrichment
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2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 16:49 UTCepss_batch

Frequently asked(5)

What is CVE-2021-20586?

CVE-2021-20586 is a high vulnerability published on January 29, 2021. Resource management errors vulnerability in a robot controller of MELFA FR Series(controller "CR800-VD" of RV-FR-D- all versions, controller "CR800-HD" of RH-FRH-D- all versions, controller "CR800-HRD" of RH-FRHR-D- all versions, controller "CR800-VR with R16RTCPU" of RV-FR-R- all versions,…

When was CVE-2021-20586 disclosed?

CVE-2021-20586 was first published in the National Vulnerability Database on January 29, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-20586 actively exploited?

CVE-2021-20586 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 84.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-20586?

CVE-2021-20586 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2021-20586?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-20586, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-20586

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-20586?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (2)

Frequently asked(5)

Related CVEs(same CWE)