What’s Vulnerable › Vulnerabilities

CVE-2021-20594

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-06 · updated 2026-06-17
• Weakness: CWE-200

Description

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.

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/index.html
• https://www.cisa.gov/uscert/ics/advisories/icsa-21-250-01
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-008_en.pdf
• https://jvn.jp/vu/JVNVU98578731/index.html
• https://www.cisa.gov/uscert/ics/advisories/icsa-21-250-01
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-008_en.pdf

Get alerted when CVE-2021-20594 or the next vulnerability affects your stack