Siemens RUGGEDCOM RST2428P Authentication Bypass by Primary Weakness (CVE-2026-3784)

medium Tenable OT Security Plugin ID 505418

Synopsis

The remote OT asset is affected by a vulnerability.

Description

curl would wrongly reuse an existing HTTP proxy connection doing CONNECT to a server, even if the new request uses different credentials for the HTTP proxy. The proper behavior is to create or use a separate connection.

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: 505418

File Name: tenable_ot_siemens_CVE-2026-3784.nasl

Version: 1.3

Type: Remote

Family: Tenable.ot

Published: 6/18/2026

Updated: 7/17/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 2.1

Percentile: 7.83

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.9

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

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

Vulnerability Information

CPE: cpe:/o:siemens:ruggedcom_rst2428p_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/2/2026

Vulnerability Publication Date: 3/11/2026

Reference Information

CVE: CVE-2026-3784

CWE: 305

ICSA: 26-188-05

Detections

Analytics