Siemens SCALANCE Improper Validation of Integrity Check Value(CVE-2020-26141)

medium Tenable OT Security Plugin ID 505331

Synopsis

The remote OT asset is affected by a vulnerability.

Description

An issue was discovered in the ALFA Windows 10 driver 6.1316.1209 for AWUS036H. The Wi-Fi implementation does not verify the Message Integrity Check (authenticity) of fragmented TKIP frames. An adversary can abuse this to inject and possibly decrypt packets in WPA or WPA2 networks that support the TKIP data-confidentiality protocol.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

Refer to the vendor advisory.

Plugin Details

Severity: Medium

ID: 505331

File Name: tenable_ot_siemens_CVE-2020-26141.nasl

Version: 1.1

Type: Remote

Family: Tenable.ot

Published: 4/21/2026

Updated: 4/21/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v3

Risk Factor: Medium

Base Score: 6.5

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

Vulnerability Information

CPE: cpe:/o:siemens:scalance_w761-1_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w788-2_m12_eec_firmware:6.6.0, cpe:/o:siemens:scalance_w786-2_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w788-1_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w778-1_m12_eec_%28usa%29_firmware:6.6.0, cpe:/o:siemens:scalance_w734-1_rj45_%28usa%29_firmware:6.6.0, cpe:/o:siemens:scalance_w788-2_m12_firmware:6.6.0, cpe:/o:siemens:scalance_w774-1_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w786-2ia_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w786-2_sfp_firmware:6.6.0, cpe:/o:siemens:scalance_w786-1_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w778-1_m12_eec_firmware:6.6.0, cpe:/o:siemens:scalance_w721-1_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w748-1_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w774-1_m12_eec_firmware:6.6.0, cpe:/o:siemens:scalance_w734-1_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w774-1_rj45_%28usa%29_firmware:6.6.0, cpe:/o:siemens:scalance_w788-1_m12_firmware:6.6.0, cpe:/o:siemens:scalance_w778-1_m12_firmware:6.6.0, cpe:/o:siemens:scalance_w748-1_m12_firmware:6.6.0, cpe:/o:siemens:scalance_w722-1_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w788-2_rj45_firmware:6.6.0, cpe:/o:siemens:scalance_w738-1_m12_firmware:6.6.0

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 7/13/2021

Vulnerability Publication Date: 7/13/2021

Reference Information

CVE: CVE-2020-26141

CWE: 354

ICSA: 22-104-04

Detections

Analytics