CVE-2021-20599 - CVE House
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Status published Critical CVE-2021-20599

Cleartext Transmission of Sensitive InformationCleartext transmission of sensitive information vulnerability...

Vulnerability Description

Cleartext Transmission of Sensitive InformationCleartext transmission of sensitive information vulnerability in MELSEC iQ-R series Safety CPU R08/16/32/120SFCPU firmware versions "26" and prior and MELSEC iQ-R series SIL2 Process CPU R08/16/32/120PSFCPU firmware versions "11" and prior allows a remote unauthenticated attacker to login to a target CPU module by obtaining credentials other than password.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

Affected Vendor

Mitsubishi Electric Corporation

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Affected Software

MELSEC iQ-R Series Safety CPU R08SFCPU, MELSEC iQ-R series Safety CPU R16SFCPU, MELSEC iQ-R series Safety CPU R32SFCPU, MELSEC iQ-R series Safety CPU R120SFCPU, MELSEC iQ-R Series SIL2 Process CPU R08PSFCPU, MELSEC iQ-R series SIL2 Process CPU R16PSFCPU, MELSEC iQ-R series SIL2 Process CPU R32PSFCPU, MELSEC iQ-R series SIL2 Process CPU R120PSFCPU
Vulnerable Versions:
Firmware versions "26" and prior, Firmware versions "11" and prior

Timeline

Official Publish: October 14th, 2021
Last Modified: August 3rd, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weaknesses (CWE)