Siemens SIMATIC S7-1500 CPU 1518 MFP Improper Input Validation (CVE-2026-53268)

high Tenable OT Security Plugin ID 505992

Synopsis

The remote OT asset is affected by a vulnerability.

Description

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: 505992

File Name: tenable_ot_siemens_CVE-2026-53268.nasl

Version: 1.2

Type: Remote

Family: Tenable.ot

Published: 10/2/2026

Updated: 10/5/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.5

Percentile: 51.9

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.3

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

CVSS Score Source: CVE-2026-53268

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

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

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

Vulnerability Information

CPE: cpe:/o:siemens:simatic_s7-1500_cpu_firmware:3.1.6, cpe:/o:siemens:siplus_s7-1500_cpu_firmware:3.1.6

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 7/14/2026

Vulnerability Publication Date: 6/25/2026

Reference Information

CVE: CVE-2026-53268

CWE: 20

Detections

Analytics