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Siemens SIMATIC S7-1200 CPU Family

(I) IoT
Siemens SIMATIC S7-1200 CPU Family

1. EXECUTIVE SUMMARY

2. RISK EVALUATION

The affected devices do not correctly process certain special crafted packets sent to Port 80/tcp and Port 102/tcp, which could allow an attacker to cause a denial of service in the device.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Siemens reports the following products are affected:

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER RESOURCE SHUTDOWN OR RELEASE CWE-404

The affected devices do not correctly process certain special crafted packets sent to Port 80/tcp, which could allow an unauthenticated attacker to cause a denial of service in the device.

CVE-2025-24811 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for CVE-2025-24811. A base score of 8.7 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.2.2 IMPROPER VALIDATION OF SYNTACTIC CORRECTNESS OF INPUT CWE-1286

The affected devices do not correctly process certain special crafted packets sent to Port 102/tcp, which could allow an attacker to cause a denial of service in the device.

CVE-2025-24812 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for CVE-2025-24812. A base score of 7.1 has been calculated; the CVSS vector string is (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.3 BACKGROUND

3.4 RESEARCHER

Gao Jian coordinated the disclosure of CVE-2025-24812 with Siemens.
Siemens then reported these vulnerabilities to CISA.

4. MITIGATIONS

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

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-224824 in HTML and CSAF.

CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities, such as:

CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.

No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.

Source:

https://www.google.com/search?sca_esv=f59d7152e7c7d7ed&sxsrf=AHTn8zoBspO0znoCOphk2jnAQvYd9vNTNg:1739876905162&q=Siemens+SIMATIC+S7-1200+CPU+Family&udm=2&fbs=ABzOT_AHBNmiFuTU8_64lAGypKHpCM5oz7hcIJgwFqolwFdFvSpsHpWKjlH5lA2fQl7ww-Qb6Kl8pcYbWwswRt0jEA8idXBn-utgnhlSxxlHSxBMzqCAFfM-zDTH6qlzlgvF7lkusftXQUuWEQeIz8wPJf4Bjqgvw41dOwdLZkpYHCbqoHFH2CLPOCtwWzerZEctFAXXDKjWmZdeij4rGljxr77X_GfCpQ&sa=X&ved=2ahUKEwi4-4nHis2LAxWVnP0HHRnqGwsQtKgLegQIEhAB&biw=1536&bih=703&dpr=1.25#vhid=WuHFRTsbPrqbBM&vssid=mosaic

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