Siemens LOGO! 8 BM Devices Buffer Copy Without Checking Size of Input (CVE-2025-40815)

high Tenable OT Security Plugin ID 504868

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability has been identified in
- LOGO! 12/24RCE (6ED1052-1MD08-0BA2) (All versions)
- LOGO! 12/24RCEo (6ED1052-2MD08-0BA2) (All versions)
- LOGO! 230RCE (6ED1052-1FB08-0BA2) (All versions)
- LOGO! 230RCEo (6ED1052-2FB08-0BA2) (All versions)
- LOGO! 24CE (6ED1052-1CC08-0BA2) (All versions)
- LOGO! 24CEo (6ED1052-2CC08-0BA2) (All versions)
- LOGO! 24RCE (6ED1052-1HB08-0BA2) (All versions)
- LOGO! 24RCEo (6ED1052-2HB08-0BA2) (All versions)
- SIPLUS LOGO! 12/24RCE (6AG1052-1MD08-7BA2) (All versions)
- SIPLUS LOGO! 12/24RCEo (6AG1052-2MD08-7BA2) (All versions)
- SIPLUS LOGO! 230RCE (6AG1052-1FB08-7BA2) (All versions)
- SIPLUS LOGO! 230RCEo (6AG1052-2FB08-7BA2) (All versions)
- SIPLUS LOGO! 24CE (6AG1052-1CC08-7BA2) (All versions)
- SIPLUS LOGO! 24CEo (6AG1052-2CC08-7BA2) (All versions)
- SIPLUS LOGO! 24RCE (6AG1052-1HB08-7BA2) (All versions)
- SIPLUS LOGO! 24RCEo (6AG1052-2HB08-7BA2) (All versions).

Affected devices do not properly validate the structure of TCP packets in several methods. This could allow an attacker to cause buffer overflows, get control over the instruction counter and run custom code.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at CISA.gov.

Siemens is preparing fixed versions and recommends specific countermeasures for products where fixes are not available or not yet available. Siemens has identified the following specific workarounds and mitigations users can apply to reduce risk:

- (CVE-2025-40815) Protect the LSC access to the device with a strong password. Currently no fix is available.
- (CVE-2025-40816, CVE-2025-40817) Restrict network access to port 10006/udp to trusted IP addresses. Currently no fix is planned.

As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To operate devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens' operational guidelines for industrial security and following recommendations in product manuals.

Additional information on industrial security by Siemens can be found on the Siemens industrial security webpage

For more information see the associated Siemens security advisory SSA-267056 in HTML and CSAF.

Plugin Details

Severity: High

ID: 504868

Version: 1.2

Type: remote

Family: Tenable.ot

Published: 12/19/2025

Updated: 12/20/2025

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v3

Risk Factor: High

Base Score: 7.2

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

Vulnerability Information

CPE: cpe:/o:siemens:siplus_logo%21_230rceo, cpe:/o:siemens:logo%21_24ceo, cpe:/o:siemens:siplus_logo%21_24rceo, cpe:/o:siemens:siplus_logo%21_24rce, cpe:/o:siemens:logo%21_12%2f24rceo, cpe:/o:siemens:siplus_logo%21_12%2f24rce, cpe:/o:siemens:siplus_logo%21_230rce, cpe:/o:siemens:logo%21_24rceo, cpe:/o:siemens:logo%21_230rceo, cpe:/o:siemens:logo%21_24ce, cpe:/o:siemens:siplus_logo%21_24ce, cpe:/o:siemens:siplus_logo%21_24ceo, cpe:/o:siemens:siplus_logo%21_12%2f24rceo, cpe:/o:siemens:logo%21_24rce, cpe:/o:siemens:logo%21_230rce, cpe:/o:siemens:logo%21_12%2f24rce

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 11/11/2025

Vulnerability Publication Date: 11/11/2025

Reference Information

CVE: CVE-2025-40815

CWE: 200

ICSA: 25-317-13

Detections

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