CVE-2025-40771
Unknown Unknown - Not Provided
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Publication date: 2025-10-14

Last updated on: 2025-10-14

Assigner: Siemens AG

Description
A vulnerability has been identified in SIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0) (All versions < V2.4.24), SIMATIC CP 1542SP-1 IRC (6GK7542-6VX00-0XE0) (All versions < V2.4.24), SIMATIC CP 1543SP-1 (6GK7543-6WX00-0XE0) (All versions < V2.4.24), SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (6AG2542-6VX00-4XE0) (All versions < V2.4.24), SIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0) (All versions < V2.4.24), SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0) (All versions < V2.4.24). Affected devices do not properly authenticate configuration connections. This could allow an unauthenticated remote attacker to access the configuration data.
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Meta Information
Published
2025-10-14
Last Modified
2025-10-14
Generated
2026-06-16
AI Q&A
2025-10-14
EPSS Evaluated
2026-06-15
NVD
CVE-2025-40771
EUVD
EUVD-2025-34160
Affected Vendors & Products
Showing 6 associated CPEs
Vendor Product Version / Range
siemens siplus_et_200sp_cp_1543sp-1_isec *
siemens siplus_et_200sp_cp_1542sp-1_irc_tx_rail *
siemens simatic_cp_1543sp-1 *
siemens simatic_cp_1542sp-1_irc *
siemens siplus_et_200sp_cp_1543sp-1_isec_tx_rail *
siemens simatic_cp_1542sp-1 *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
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Executive Summary

This vulnerability affects Siemens SIMATIC ET 200SP communication processors, including models CP 1542SP-1, CP 1542SP-1 IRC, CP 1543SP-1, and their SIPLUS variants. The issue is that these devices do not properly authenticate configuration connections, which means an unauthenticated remote attacker could gain access to sensitive configuration data. [1]

Impact Analysis

Because the affected devices do not properly authenticate configuration connections, an unauthenticated remote attacker could access and potentially manipulate sensitive configuration data. This could lead to unauthorized changes in device settings, disruption of industrial network operations, and compromise of the security functions these devices provide, such as firewalls and VPNs. [1]

Detection Guidance

The vulnerability involves improper authentication of configuration connections on affected Siemens SIMATIC ET 200SP communication processors. Detection can involve checking the firmware version of the devices to see if they are running a version prior to 2.4.24, which are vulnerable. Siemens does not provide specific detection commands in the provided resources. However, network administrators can identify affected devices by their part numbers and verify firmware versions via device management interfaces or Siemens configuration tools. Monitoring for unauthorized configuration access attempts on these devices may also help detect exploitation attempts. [1]

Mitigation Strategies

Immediate mitigation steps include updating all affected Siemens SIMATIC ET 200SP communication processors to firmware version 2.4.24 or later, which addresses the vulnerability. As an interim measure before updating, restrict access to the affected devices to trusted IP addresses only. Additionally, follow Siemens' general security recommendations such as protecting network access with appropriate security mechanisms and configuring devices according to Siemens' operational guidelines for Industrial Security. [1]

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