Siemens SIPROTEC 5 Allocation of Resources Without Limits or Throttling (CVE-2025-40570)

low Tenable OT Security Plugin ID 504808

Synopsis

The remote OT asset is affected by a vulnerability.

Description

Affected devices do not properly limit the bandwidth for incoming network packets over their local USB port. This could allow an attacker with physical access to send specially crafted packets with high bandwidth to the affected devices thus forcing them to exhaust their memory and stop responding to any network traffic via the local USB port. Affected devices reset themselves automatically after a successful attack. The protection function is not affected of this vulnerability.

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 has identified the following specific workarounds and mitigations users can apply to reduce risk:

- SIPROTEC 5 6MD84 (CP300), SIPROTEC 5 6MD85 (CP300), SIPROTEC 5 6MD86 (CP300), SIPROTEC 5 6MD89 (CP300), SIPROTEC 5 6MU85 (CP300), SIPROTEC 5 7KE85 (CP300), SIPROTEC 5 7SA86 (CP300), SIPROTEC 5 7SA87 (CP300), SIPROTEC 5 7SD86 (CP300), SIPROTEC 5 7SD87 (CP300), SIPROTEC 5 7SJ85 (CP300), SIPROTEC 5 7SJ86 (CP300), SIPROTEC 5 7SK85 (CP300), SIPROTEC 5 7SL86 (CP300), SIPROTEC 5 7SL87 (CP300), SIPROTEC 5 7SS85 (CP300), SIPROTEC 5 7ST85 (CP300), SIPROTEC 5 7ST86 (CP300), SIPROTEC 5 7SX85 (CP300), SIPROTEC 5 7UM85 (CP300), SIPROTEC 5 7UT85 (CP300), SIPROTEC 5 7UT86 (CP300), SIPROTEC 5 7UT87 (CP300), SIPROTEC 5 7VE85 (CP300), SIPROTEC 5 7VK87 (CP300), SIPROTEC 5 7VU85 (CP300): Update to V10.0 or later version
- SIPROTEC 5 7SA82 (CP150), SIPROTEC 5 7SD82 (CP150), SIPROTEC 5 7SJ81 (CP150), SIPROTEC 5 7SJ82 (CP150), SIPROTEC 5 7SK82 (CP150), SIPROTEC 5 7SL82 (CP150), SIPROTEC 5 7SX82 (CP150), SIPROTEC 5 7SY82 (CP150), SIPROTEC 5 7UT82 (CP150):
Update to V10.0 or later version
- SIPROTEC 5 Compact 7SX800 (CP050): Update to V10.0 or later version

As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens' operational guidelines for industrial security and following recommendations in the 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-894058 in HTML and CSAF.

Plugin Details

Severity: Low

ID: 504808

File Name: tenable_ot_siemens_CVE-2025-40570.nasl

Version: 1.3

Type: remote

Family: Tenable.ot

Published: 11/18/2025

Updated: 2/14/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 2.2

CVSS v3

Risk Factor: Low

Base Score: 2.4

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

Vulnerability Information

CPE: cpe:/o:siemens:siprotec_5_7sa86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7ve85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sd87_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sl82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7sk85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_compact_7sx800_%28cp050%29_firmware, cpe:/o:siemens:siprotec_5_7sk82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7sj81_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_6md86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7vu85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7ut86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_6mu85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7st86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sd82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_6md85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7ut85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sd86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sx82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7vk87_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sj82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7ke85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7um85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sl87_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sj86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sx85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sa82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7ut82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7sy82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7st85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sj85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sa87_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7ss85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_6md84_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_6md89_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7ut87_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sl86_%28cp300%29_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 8/12/2025

Vulnerability Publication Date: 8/12/2025

Reference Information

CVE: CVE-2025-40570

CWE: 770

ICSA: 25-226-10

Detections

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