What’s Vulnerable › Vulnerabilities

CVE-2021-20599

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-14 · updated 2026-06-17
• Weakness: CWE-319

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.

Affected products

• Mitsubishielectric R08Psfcpu Firmware: all versions
• Mitsubishielectric R08Sfcpu Firmware: all versions
• Mitsubishielectric R120Psfcpu Firmware: all versions
• Mitsubishielectric R120Sfcpu Firmware: all versions
• Mitsubishielectric R16Psfcpu Firmware: all versions
• Mitsubishielectric R16Sfcpu Firmware: all versions
• Mitsubishielectric R32Psfcpu Firmware: all versions
• Mitsubishielectric R32Sfcpu Firmware: all versions

References

• https://jvn.jp/vu/JVNVU98578731
• https://www.cisa.gov/uscert/ics/advisories/icsa-21-287-03
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-011_en.pdf
• https://jvn.jp/vu/JVNVU98578731
• https://www.cisa.gov/uscert/ics/advisories/icsa-21-287-03
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-011_en.pdf

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