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

CVE-2021-20586 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 2.7%.

Rv2Fr Firmware CVE-2021-20586

HIGH

2021-01-29 Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp

Information Disclosure Rv2Fr Firmware Rv2Frl Firmware Rv4Fr Firmware Rv4Frl Firmware Rv7Fr Firmware Rv7Frl Firmware Rv7Frll Firmware Rv13Fr Firmware Rv13Frl Firmware Rv20Fr Firmware Rh1Frhr Firmware Rh3Frhr Firmware Rh3Frh35 Firmware Rh3Frh45 Firmware Rh3Frh55 Firmware Rh6Frh35 Firmware Rh6Frh45 Firmware Rh6Frh55 Firmware Rh12Frh55 Firmware Rh12Rfh70 Firmware Rh12Frh85 Firmware Rh20Frh85 Firmware Rh20Frh100 Firmware Rv2Fr B Firmware Rv2Frl B Firmware Rv4Frm C Firmware Rv4Frlm C Firmware Rv7Frm C Firmware Rv7Frlm C Firmware Rv7Frllm C Firmware Rv13Frm C Firmware Rv13Frlm C Firmware Rv20Frm C Firmware Mitsubishielectric

7.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Impact	CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 2.7% exploitation probability (EPSS)

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AnalysisAI

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,. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

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Technical ContextAI · show details

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. Affected products include: Mitsubishielectric Rv2Fr Firmware, Mitsubishielectric Rv2Frl Firmware, Mitsubishielectric Rv4Fr Firmware, Mitsubishielectric Rv4Frl Firmware, Mitsubishielectric Rv7Fr Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

DescriptionNVD

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.

Threat Intelligence Overview

EPSS Score

2.7%

Top 16% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 2.7%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +3

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.