Siemens SENTRON PAC Out-of-bounds Write (CVE-2020-17437)

high Tenable OT Security Plugin ID 505360

Synopsis

The remote OT asset is affected by a vulnerability.

Description

The TCP/IP stack (uIP) in affected devices is vulnerable to out-of-bounds write when processing TCP packets with urgent pointer (URG) where the location of the TCP data payload is calculated improperly. An attacker located in the same network could trigger a Denial-of-Service condition on the device by sending a specially crafted IP packet.

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: High

ID: 505360

File Name: tenable_ot_siemens_CVE-2020-17437.nasl

Version: 1.1

Type: Remote

Family: Tenable.ot

Published: 6/3/2026

Updated: 6/3/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.2

CVSS v2

Risk Factor: Medium

Base Score: 6.4

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

CVSS Score Source: CVE-2020-17437

CVSS v3

Risk Factor: High

Base Score: 8.2

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

Vulnerability Information

CPE: cpe:/o:siemens:sentron_pac3200_firmware, cpe:/o:siemens:sentron_pac3200t_firmware, cpe:/o:siemens:sentron_pac3220_firmware, cpe:/o:siemens:sentron_pac4200_firmware, cpe:/o:siemens:sentron_pac2200_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 12/11/2020

Vulnerability Publication Date: 12/11/2020

Reference Information

CVE: CVE-2020-17437

CWE: 787

ICSA: 20-343-01

Detections

Analytics