Siemens SCALANCE W1750D Improper Input Validation (CVE-2021-25145)

medium Tenable OT Security Plugin ID 500990


The remote OT asset is affected by a vulnerability.


A remote unauthorized disclosure of information vulnerability was discovered in some Aruba Instant Access Point (IAP) products in version(s): Aruba Instant 6.4.x: and below; Aruba Instant 6.5.x: and below; Aruba Instant 8.3.x: and below; Aruba Instant 8.5.x: and below; Aruba Instant 8.6.x: and below; Aruba Instant 8.7.x: and below. Aruba has released patches for Aruba Instant that address this security vulnerability.

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The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at

Siemens recommends upgrading SCALANCE W1750D to v8.7.1.3 or later

Siemens has identified the following specific workarounds and mitigations for users to apply to reduce the risk:

- Block access to the Aruba Instant device IP address on Port 8211/UDP from all untrusted users.
- Block access to the Aruba Instant Command Line Interface from all untrusted users.
- Block access to the Aruba Instant Web Management Interface from all untrusted users.

As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens’ operational guidelines for industrial security and following the recommendations in the product manuals.

For additional information see Siemens Security Advisory SSA-723417

See Also

Plugin Details

Severity: Medium

ID: 500990

Version: 1.2

Type: remote

Family: Tenable.ot

Published: 4/11/2023

Updated: 7/24/2023

Supported Sensors: Tenable OT Security

Risk Information


Risk Factor: Low

Score: 3.6


Risk Factor: Low

Base Score: 3.3

Temporal Score: 2.4

Vector: CVSS2#AV:A/AC:L/Au:N/C:P/I:N/A:N

CVSS Score Source: CVE-2021-25145


Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:siemens:scalance_w1750d_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 3/30/2021

Vulnerability Publication Date: 3/30/2021

Reference Information

CVE: CVE-2021-25145