Siemens SIMATIC S7-1500 CPU 1518 MFP Improper Input Validation (CVE-2026-52999)

critical Tenable OT Security Plugin ID 505976

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: Critical

ID: 505976

File Name: tenable_ot_siemens_CVE-2026-52999.nasl

Version: 1.1

Type: Remote

Family: Tenable.ot

Published: 10/2/2026

Updated: 10/2/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.49

CVSS v3

Risk Factor: Critical

Base Score: 9.1

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

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: 6/3/2026

Reference Information

CVE: CVE-2026-52999

CWE: 20

Detections

Analytics