What’s Vulnerable › Vulnerabilities

CVE-2021-20613

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-01-14 · updated 2026-06-17
• Weakness: CWE-665

Description

Improper initialization vulnerability in MELSEC-F series FX3U-ENET Firmware version 1.16 and prior, FX3U-ENET-L Firmware version 1.16 and prior and FX3U-ENET-P502 Firmware version 1.16 and prior allows a remote unauthenticated attacker to cause a denial-of-service (DoS) condition in communication function of the product by sending specially crafted packets. Control by MELSEC-F series PLC is not affected by this vulnerability, but system reset is required for recovery.

Affected products

• Mitsubishielectric Fx3U-Enet-L Firmware: through 1.16
• Mitsubishielectric Fx3U-Enet-P502 Firmware: through 1.16
• Mitsubishielectric Fx3U-Enet Firmware: through 1.16

References

• https://jvn.jp/vu/JVNVU93268332/index.html
• https://www.cisa.gov/uscert/ics/advisories/icsa-22-013-07
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-024_en.pdf
• https://jvn.jp/vu/JVNVU93268332/index.html
• https://www.cisa.gov/uscert/ics/advisories/icsa-22-013-07
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-024_en.pdf

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