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Beckhoff TwinCAT Read Access Violation (CVE-2011-3486)

medium Tenable OT Security Plugin ID 500331

Synopsis

The remote OT asset is affected by a vulnerability.

Description

Beckhoff TwinCAT 2.11.0.2004 and earlier allows remote attackers to cause a denial of service via a crafted request to UDP port 48899, which triggers an out-of-bounds read.

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.

See Also

http://aluigi.altervista.org/adv/twincat_1-adv.txt

http://securityreason.com/securityalert/8380

https://exchange.xforce.ibmcloud.com/vulnerabilities/69765

Plugin Details

Severity: Medium

ID: 500331

File Name: tenable_ot_beckhoff_CVE-2011-3486.nasl

Version: 1.5

Type: Remote

Family: Tenable.ot

Published: 2/7/2022

Updated: 4/21/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

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

CVSS Score Source: CVE-2011-3486

Vulnerability Information

CPE: cpe:/a:beckhoff:twincat

Required KB Items: Tenable.ot/Beckhoff

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/16/2011

Vulnerability Publication Date: 9/16/2011

Reference Information

CVE: CVE-2011-3486

CWE: 119

OSVDB: 75495