Wago CODESYS V2 Runtime Toolkit Improper Handling of Exceptional Conditions (CVE-2021-34593)

medium Tenable OT Security Plugin ID 503326

Synopsis

The remote OT asset is affected by a vulnerability.

Description

In CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56 unauthenticated crafted invalid requests may result in several denial-of-service conditions. Running PLC programs may be stopped, memory may be leaked, or further communication clients may be blocked from accessing the PLC.

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: 503326

Version: 1.1

Type: remote

Family: Tenable.ot

Published: 9/9/2025

Updated: 9/9/2025

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

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

CVSS Score Source: CVE-2021-34593

Vulnerability Information

CPE: cpe:/o:wago:750-8202_firmware, cpe:/o:wago:750-8203_firmware, cpe:/o:wago:750-8204_firmware, cpe:/o:wago:750-8206_firmware, cpe:/o:wago:750-8207_firmware, cpe:/o:wago:750-8208_firmware, cpe:/o:wago:750-8210_firmware, cpe:/o:wago:750-8211_firmware, cpe:/o:wago:750-8212_firmware, cpe:/o:wago:750-8213_firmware, cpe:/o:wago:750-8214_firmware, cpe:/o:wago:750-8216_firmware, cpe:/o:wago:750-8217_firmware

Required KB Items: Tenable.ot/Wago

Exploit Ease: No known exploits are available

Patch Publication Date: 10/26/2021

Vulnerability Publication Date: 10/26/2021

Reference Information

CVE: CVE-2021-34593

CWE: 755

Detections

Analytics