Siemens SIMATIC S7-1500 CPU 1518 MFP Expired Pointer Dereference (CVE-2025-39978)

medium Tenable OT Security Plugin ID 505759

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: Medium

ID: 505759

File Name: tenable_ot_siemens_CVE-2025-39978.nasl

Version: 1.2

Type: Remote

Family: Tenable.ot

Published: 7/27/2026

Updated: 7/28/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.92

CVSS v3

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5.6

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

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 7/14/2026

Vulnerability Publication Date: 10/14/2025

Reference Information

CVE: CVE-2025-39978

CWE: 825

Detections

Analytics