CVE-2021-20613

HIGH
7.5
CVSS Score
Published: January 14, 2022 at 07:04 PM UTC
Updated: June 17, 2026 at 03:34 AM UTC
9 products affected across 1 vendorFX3U Enet L FirmwareFX3U Enet P502 FirmwareFX3U Enet Firmware

Using MELSEC-F series FX3U-ENET; MELSEC-F series FX3U-ENET-L; MELSEC-F series FX3U-ENET-P502 by N/A?

Get instant alerts when new vulnerabilities affect MELSEC-F series FX3U-ENET; MELSEC-F series FX3U-ENET-L; MELSEC-F series FX3U-ENET-P502 - before attackers find them.

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Severity
HIGH7.5
Exploit prediction
EPSS 4%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≤ 1.16
mitsubishielectric-fx3u-enet (same device)
v ≤ 1.16
mitsubishielectric-fx3u-enet-l (same device)
v ≤ 1.16
mitsubishielectric-fx3u-enet-p502 (same device)
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (3)

x_refsource_MISCThird Party AdvisoryVDB Entry
https://jvn.jp/vu/JVNVU93268332/index.html
x_refsource_MISCThird Party AdvisoryUS Government Resource
https://www.cisa.gov/uscert/ics/advisories/icsa-22-013-07

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-665

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