High severity7.5NVD Advisory· Published Jan 14, 2022· Updated Jun 17, 2026
CVE-2021-20613
CVE-2021-20613
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
5- Range: <=1.16
- MELSEC-F series/FX3U-ENET Firmwaredescription
- cpe:2.3:o:mitsubishielectric:fx3u-enet_firmware:*:*:*:*:*:*:*:*Range: <=1.16
- cpe:2.3:o:mitsubishielectric:fx3u-enet-l_firmware:*:*:*:*:*:*:*:*Range: <=1.16
- cpe:2.3:o:mitsubishielectric:fx3u-enet-p502_firmware:*:*:*:*:*:*:*:*Range: <=1.16
Patches
Vulnerability mechanics
References
3- jvn.jp/vu/JVNVU93268332/index.htmlnvdThird Party AdvisoryVDB Entry
- www.cisa.gov/uscert/ics/advisories/icsa-22-013-07nvdThird Party AdvisoryUS Government Resource
- www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-024_en.pdfnvdVendor Advisory
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