Siemens SCALANCE Improper Neutralization of Special Elements in Output Used by a Downstream Component (CVE-2020-26140)

medium Tenable OT Security Plugin ID 500973

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 WEP, WPA, WPA2, and WPA3 implementations accept plaintext frames in a protected Wi-Fi network. An adversary can abuse this to inject arbitrary data frames independent of the network configuration.

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: 500973

File Name: tenable_ot_siemens_CVE-2020-26140.nasl

Version: 1.4

Type: Remote

Family: Tenable.ot

Published: 4/11/2023

Updated: 4/21/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Low

Base Score: 3.3

Temporal Score: 2.4

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

CVSS Score Source: CVE-2020-26140

CVSS v3

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:N/I:H/A:N

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

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: 5/11/2021

Vulnerability Publication Date: 5/11/2021

Reference Information

CVE: CVE-2020-26140

CWE: 74

ICSA: 22-104-04

Detections

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