CVE-2021-20594 : Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Mits

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU firmware versions "26" and prior and Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU firmware versions "11" and prior allows a remote unauthenticated attacker to acquire legitimate user names registered in the module via brute-force attack on user names.

Published 2021-08-06 17:15:07

Updated 2024-05-24 08:15:09

Source Mitsubishi Electric Corporation

View at NVD, CVE.org

Products affected by CVE-2021-20594

Mitsubishielectric » R08sfcpu Firmware
cpe:2.3:o:mitsubishielectric:r08sfcpu_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Mitsubishielectric » R08sfcpu » Version: N/A
Mitsubishielectric » R16sfcpu Firmware
cpe:2.3:o:mitsubishielectric:r16sfcpu_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Mitsubishielectric » R16sfcpu » Version: N/A
Mitsubishielectric » R32sfcpu Firmware
cpe:2.3:o:mitsubishielectric:r32sfcpu_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Mitsubishielectric » R32sfcpu » Version: N/A
Mitsubishielectric » R120sfcpu Firmware
cpe:2.3:o:mitsubishielectric:r120sfcpu_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Mitsubishielectric » R120sfcpu » Version: N/A
Mitsubishielectric » R08psfcpu Firmware
cpe:2.3:o:mitsubishielectric:r08psfcpu_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Mitsubishielectric » R08psfcpu » Version: N/A
Mitsubishielectric » R16psfcpu Firmware
cpe:2.3:o:mitsubishielectric:r16psfcpu_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Mitsubishielectric » R16psfcpu » Version: N/A
Mitsubishielectric » R32psfcpu Firmware
cpe:2.3:o:mitsubishielectric:r32psfcpu_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Mitsubishielectric » R32psfcpu » Version: N/A
Mitsubishielectric » R120psfcpu Firmware
cpe:2.3:o:mitsubishielectric:r120psfcpu_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Mitsubishielectric » R120psfcpu » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2021-20594

EPSS FAQ

0.41%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 74 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-20594

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:P/I:N/A:N	10.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: None Availability Impact: None
7.5	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	3.9	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: None Availability: None

CWE ids for CVE-2021-20594

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-20594

https://www.cisa.gov/uscert/ics/advisories/icsa-21-250-01

Mitsubishi Electric MELSEC iQ-R Series (Update A) | CISA

CVEs referencing this url
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-008_en.pdf

Vendor Advisory
https://jvn.jp/vu/JVNVU98578731/index.html

JVNVU#98578731: 三菱電機製 MELSEC iQ-R シリーズ CPU ユニットにおける複数の脆弱性
Third Party Advisory

CVEs referencing this url

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Vulnerability Details : CVE-2021-20594

Products affected by CVE-2021-20594

Exploit prediction scoring system (EPSS) score for CVE-2021-20594

CVSS scores for CVE-2021-20594

CWE ids for CVE-2021-20594

References for CVE-2021-20594