Siemens AG — CraftedSignal Threat Feed

Siemens Teamcenter Hardcoded Key Vulnerability (CVE-2026-33893)

hello@craftedsignal.io — Tue, 12 May 2026 10:24:22 +0000

A vulnerability, identified as CVE-2026-33893, affects Siemens Teamcenter. This vulnerability exists due to the presence of hardcoded keys used for obfuscation within the application code. An attacker who successfully obtains these keys could potentially misuse them to bypass security measures and gain unauthorized access to sensitive data or system functionalities. Affected versions include Teamcenter V2312 (all versions prior to V2312.0014), Teamcenter V2406 (all versions prior to V2406.0012), Teamcenter V2412 (all versions prior to V2412.0009), Teamcenter V2506 (all versions prior to V2506.0005), and Teamcenter V2512. This issue poses a significant risk to organizations relying on Teamcenter for product lifecycle management.

Attack Chain

An attacker identifies a vulnerable Teamcenter instance exposed over the network.
The attacker reverse engineers the Teamcenter application binaries.
The attacker locates the hardcoded key within the application’s code.
The attacker uses the hardcoded key to decrypt or deobfuscate sensitive data.
The attacker leverages the decrypted data to bypass authentication or authorization controls.
The attacker gains unauthorized access to Teamcenter functionalities and data.
The attacker exfiltrates sensitive data or manipulates the system to achieve their objectives.

Impact

Successful exploitation of CVE-2026-33893 can lead to unauthorized access to sensitive product data, intellectual property, or control over Teamcenter functionalities. The impact includes potential data breaches, manipulation of product designs, and disruption of product lifecycle management processes. The severity is rated as high with a CVSS v3.1 score of 7.5, indicating a significant risk to confidentiality.

Recommendation

Apply the patches provided by Siemens AG to upgrade Teamcenter to the fixed versions: V2312.0014, V2406.0012, V2412.0009, and V2506.0005 to remediate CVE-2026-33893.
Monitor network traffic for unusual access patterns to Teamcenter resources.
Deploy the following Sigma rule to detect processes attempting to access Teamcenter binaries to extract hardcoded keys.
Review Teamcenter access logs for unauthorized access attempts following patch application.

ROS# Path Traversal Vulnerability (CVE-2026-41551)

hello@craftedsignal.io — Tue, 12 May 2026 10:24:08 +0000

A path traversal vulnerability, identified as CVE-2026-41551, affects ROS# versions prior to V2.2.2. The vulnerability stems from a lack of proper sanitization of user input, potentially allowing a remote attacker to read arbitrary files on the affected system. This issue was reported by Siemens AG. This vulnerability is especially critical because it can lead to unauthorized access of sensitive information on systems running ROS#, which are commonly used in robotics and automation applications. Successful exploitation bypasses intended security restrictions and compromises data confidentiality.

Attack Chain

The attacker identifies a ROS# instance running a version prior to 2.2.2.
The attacker crafts a malicious HTTP request containing a path traversal sequence (e.g., “../../../etc/passwd”) within a user-supplied input field.
The malicious request is sent to a vulnerable endpoint within the ROS# application.
The ROS# application processes the request without properly sanitizing the path traversal sequence.
The application attempts to access a file based on the manipulated path.
Due to the path traversal, the application reads a file outside of the intended directory (e.g., /etc/passwd).
The attacker receives the contents of the arbitrary file in the HTTP response.
The attacker gains unauthorized access to sensitive information, potentially leading to further exploitation or system compromise.

Impact

Successful exploitation of CVE-2026-41551 can allow an attacker to read arbitrary files on the affected system. This can lead to the disclosure of sensitive information such as configuration files, credentials, or other confidential data. The CVSS v3.1 base score for this vulnerability is 9.1, highlighting the high risk associated with this issue. Affected sectors include robotics, automation, and industrial control systems where ROS# is used.

Recommendation

Upgrade to ROS# version V2.2.2 or later to remediate CVE-2026-41551 by patching the vulnerable code.
Deploy the Sigma rules provided in this brief to detect path traversal attempts targeting ROS# installations, monitoring for suspicious characters in web requests.
Implement input validation and sanitization measures to prevent path traversal vulnerabilities in ROS# applications. Specifically, filter “..”, “.” and other traversal characters from user input.

CVE-2026-25789 - Firmware Update Page Filename Sanitization Vulnerability

hello@craftedsignal.io — Tue, 12 May 2026 10:20:31 +0000

CVE-2026-25789 exposes a vulnerability affecting certain devices where the Firmware Update page lacks proper filename validation and sanitization. A remote attacker could exploit this by crafting a malicious filename containing JavaScript code and socially engineering a user into selecting this “firmware” file for upload. The malicious JavaScript would then execute within the context of the authenticated user’s session, even without the file being fully uploaded, potentially allowing the attacker to hijack the user’s session or steal their credentials. This vulnerability highlights the importance of proper input validation to prevent cross-site scripting (XSS) attacks. Siemens AG has acknowledged this vulnerability.

Attack Chain

Attacker identifies a vulnerable device with a Firmware Update page.
Attacker crafts a malicious filename containing embedded JavaScript code (e.g., .bin).
Attacker hosts or distributes the malicious “firmware” file.
Attacker uses social engineering to trick a user into selecting the malicious file on the Firmware Update page.
The user selects the malicious file for upload through the web interface.
The vulnerable device processes the filename without proper sanitization.
The embedded JavaScript code is executed in the user’s browser session.
Attacker gains control of the user’s session, enabling credential theft or other malicious activities.

Impact

Successful exploitation of CVE-2026-25789 can lead to session hijacking and credential theft. An attacker could gain unauthorized access to the device’s management interface, potentially modifying device configurations, injecting malware, or accessing sensitive data. While the NVD entry does not specify the number of affected devices, it is classified as HIGH severity with a CVSS v3.1 score of 7.1.

Recommendation

Examine web server logs for requests to the Firmware Update page containing suspicious filenames with JavaScript-related keywords using the Sigma rule “Detect Suspicious Firmware Update Filenames”.
Implement input validation and sanitization on the Firmware Update page to prevent the execution of arbitrary JavaScript code.
Educate users about the risks of downloading and uploading firmware files from untrusted sources.
Apply the security patch provided by Siemens AG to remediate CVE-2026-25789 (reference: https://cert-portal.siemens.com/productcert/html/ssa-688146.html).

CVE-2026-22925: Siemens SIMATIC CN 4100 Resource Exhaustion via TCP SYN Flood

hello@craftedsignal.io — Tue, 12 May 2026 10:20:17 +0000

Siemens SIMATIC CN 4100 is vulnerable to a resource exhaustion attack (CVE-2026-22925) affecting all versions prior to V5.0. An attacker can exploit this vulnerability by sending a high volume of TCP SYN packets to the affected device. This leads to the exhaustion of system resources, ultimately causing a denial-of-service (DoS) condition. Successful exploitation renders the SIMATIC CN 4100 service unavailable, impacting operational continuity. This vulnerability is a significant concern for organizations relying on SIMATIC CN 4100 for critical network functions, as it can disrupt services and potentially lead to financial or operational losses.

Attack Chain

The attacker identifies a SIMATIC CN 4100 device running a version prior to V5.0.
The attacker establishes a TCP connection with the target device.
The attacker floods the target with a high volume of TCP SYN packets.
The device attempts to allocate resources for each incoming SYN packet.
Due to the high volume, the device’s memory and CPU resources are rapidly consumed.
The device becomes unresponsive to legitimate requests.
The SIMATIC CN 4100 service becomes unavailable.
A denial-of-service condition is achieved, disrupting network operations.

Impact

Successful exploitation of CVE-2026-22925 results in a denial-of-service condition on the SIMATIC CN 4100 device. This can disrupt network operations and potentially lead to financial losses due to downtime. The number of affected devices and sectors is unknown, but any organization using vulnerable versions of SIMATIC CN 4100 is at risk. If the attack succeeds, critical network functions may be unavailable, leading to operational disruptions and potential safety concerns.

Recommendation

Upgrade SIMATIC CN 4100 to version V5.0 or later to patch CVE-2026-22925, as per the Siemens advisory.
Implement rate limiting on network devices to mitigate the impact of TCP SYN floods, as the vulnerability is triggered by a high volume of SYN packets.
Deploy the Sigma rule Detect Suspicious TCP SYN Flood to identify potential exploitation attempts targeting SIMATIC CN 4100 devices.

CVE-2025-40833 Null Pointer Dereference in Affected Devices Leads to Denial of Service

hello@craftedsignal.io — Tue, 12 May 2026 10:18:59 +0000

CVE-2025-40833 describes a null pointer dereference vulnerability affecting certain devices. The vulnerability is triggered when processing specially crafted IPv4 requests. An unauthenticated, remote attacker can exploit this flaw to cause a denial-of-service (DoS) condition on the affected device. Successful exploitation requires a manual restart of the device to restore functionality. Siemens AG reported this vulnerability. The affected product list is not specified in the NVD or Siemens advisory.

Attack Chain

The attacker identifies a target device that is vulnerable to CVE-2025-40833.
The attacker crafts a malicious IPv4 request specifically designed to trigger the null pointer dereference.
The attacker sends the crafted IPv4 request to the targeted device.
The vulnerable code within the device attempts to process the malicious IPv4 request.
Due to the crafted nature of the request, a null pointer is dereferenced during processing.
This null pointer dereference causes the device to crash or become unresponsive.
The device enters a denial-of-service (DoS) state.
System administrators must manually restart the device to restore normal operation.

Impact

Successful exploitation of CVE-2025-40833 results in a denial-of-service condition. This can disrupt critical services provided by the affected device. The device becomes unresponsive, requiring a manual restart to recover. The specific number of affected devices and the sectors they belong to are unknown.

Recommendation

Identify potentially vulnerable assets by cross-referencing internal asset lists with the Siemens security advisory linked in the references.
Monitor network traffic for suspicious or malformed IPv4 requests targeting potentially vulnerable devices. Deploy the Sigma rule provided to detect potential exploitation attempts.
Investigate and validate the patch provided by Siemens as detailed in the reference link to remediate the vulnerability.
Consider implementing rate limiting on IPv4 traffic to potentially mitigate the impact of a DoS attack.