CVE-2021-40334

SSH activation problem in the proprietary management protocol (port TCP 5558)

HIGH
7.5
CVSS Score
Published: December 2, 2021 at 06:28 PM UTC
Updated: June 17, 2026 at 04:06 AM UTC
5 products affected across 1 vendorFOX615 FirmwareXCM20 FirmwareFox615

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Severity
HIGH7.5
Exploit prediction
EPSS 1.0%

Description

Missing Handler vulnerability in the proprietary management protocol (port TCP 5558) of Hitachi Energy FOX61x, XCM20 allows an attacker that exploits the vulnerability by activating SSH on port TCP 5558 to cause disruption to the NMS and NE communication. This issue affects: Hitachi Energy FOX61x versions prior to R15A. Hitachi Energy XCM20 versions prior to R15A.

Affected

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

v < r15a
Affected range stops below r15a, so it looks safe — our inference, not a vendor statement
hitachienergy-fox615 (same device)
v < r15a
Affected range stops below r15a, so it looks safe — our inference, not a vendor statement
hitachienergy-xcm20 (same device)
v < R15A
Affected range stops below R15A, so it looks safe — our inference, not a vendor statement
v < R15A
Affected range stops below R15A, so it looks safe — our inference, not a vendor statement
All versions

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-431NVD-CWE-Other

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