Detections
Analytics

Phoenix Contact ILC PLCs Denial of Service (CVE-2021-33541)

high Tenable OT Security Plugin ID 500739

Synopsis

The remote OT asset is affected by a vulnerability.

Description

Phoenix Contact Classic Line Controllers ILC1x0 and ILC1x1 in all versions/variants are affected by a Denial-of-Service vulnerability.
The communication protocols and device access do not feature authentication measures. Remote attackers can use specially crafted IP packets to cause a denial of service on the PLC's network communication module. A successful attack stops all network communication. To restore the network connectivity the device needs to be restarted. The automation task is not affected.

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

https://cert.vde.com/en-us/advisories/vde-2021-019

Plugin Details

Severity: High

ID: 500739

Version: 1.2

Type: remote

Family: Tenable.ot

Published: 1/25/2023

Updated: 10/17/2023

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2021-33541

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: cpe:/o:phoenixcontact:ilc1x0_firmware, cpe:/o:phoenixcontact:ilc1x1_firmware

Required KB Items: Tenable.ot/PhoenixContact

Exploit Ease: No known exploits are available

Patch Publication Date: 6/25/2021

Vulnerability Publication Date: 6/25/2021

Reference Information

CVE: CVE-2021-33541

CWE: 770