CVE-2021-20586

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
84.6%
KEV
Not listed

Published

January 29, 2021

Last Modified

November 21, 2024

References (2)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 14:15 UTCEPSS rescore
  2. 2026-07-23 01:56 UTCEG score recompute
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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 84.6% 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.

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