---
title: "Siemens RUGGEDCOM ROS Flaw Allows DoS Attacks—Patch Now"
short_title: "Siemens RUGGEDCOM ROS DoS vulnerability fix"
description: "Siemens warns of a medium-severity DoS vulnerability (CVE-2025-40935) in RUGGEDCOM ROS devices. Learn how to mitigate risks and update affected systems."
author: "Vitus"
date: 2025-01-24
categories: [Cybersecurity, Vulnerabilities]
tags: [siemens, ruggedcom, dos, cve-2025-40935, industrial-security]
score: 0.65
cve_ids: [CVE-2025-40935]
---
TL;DR
Siemens has disclosed a temporary Denial of Service (DoS) vulnerability (CVE-2025-40935) in its RUGGEDCOM ROS devices. An authenticated remote attacker could exploit this flaw to crash and reboot affected devices, disrupting critical operations. Siemens has released patches—update to version 5.10.1 or later to mitigate risks.
---
Main Content
Introduction
Siemens has issued a security advisory addressing a medium-severity vulnerability in its RUGGEDCOM ROS industrial devices. Tracked as CVE-2025-40935, the flaw stems from improper input validation during the TLS certificate upload process. If exploited, it could allow an authenticated remote attacker to trigger a temporary DoS condition, causing the device to crash and reboot. This poses risks to critical manufacturing sectors worldwide, where RUGGEDCOM devices are widely deployed.
Key Points
- Vulnerability: CVE-2025-40935 (Improper Input Validation) enables temporary DoS attacks.
- Affected Devices: 20+ RUGGEDCOM ROS models, including RSG2100, RS900, and RST2228 series.
- CVSS Score: 4.3 (Medium Severity).
- Exploitation Requirements: Attacker must be authenticated and have remote access to the web service.
- Mitigation: Update to RUGGEDCOM ROS version 5.10.1 or later.
---
Technical Details
The vulnerability arises from insufficient validation of input during the TLS certificate upload process in the web service of affected RUGGEDCOM ROS devices. An authenticated remote attacker could craft malicious input to trigger a device crash and reboot, leading to a temporary DoS condition. The flaw is classified under CWE-20 (Improper Input Validation) and has a CVSS v3.1 base score of 4.3, with the following vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
#### Affected Systems
The following RUGGEDCOM ROS devices running version 5.X are affected:
- RUGGEDCOM RMC8388
- RUGGEDCOM RS416Pv2
- RUGGEDCOM RS416v2
- RUGGEDCOM RS900 (32M)
- RUGGEDCOM RS900G (32M)
- RUGGEDCOM RSG2100 (32M)
- RUGGEDCOM RSG2100P (32M)
- RUGGEDCOM RSG2288
- RUGGEDCOM RSG2300
- RUGGEDCOM RSG2300P
- RUGGEDCOM RSG2488
- RUGGEDCOM RSG907R
- RUGGEDCOM RSG908C
- RUGGEDCOM RSG909R
- RUGGEDCOM RSG910C
- RUGGEDCOM RSG920P
- RUGGEDCOM RSL910
- RUGGEDCOM RST2228
- RUGGEDCOM RST2228P
- RUGGEDCOM RST916C
- RUGGEDCOM RST916P
---
Impact Assessment
While the vulnerability is rated medium severity, its exploitation could disrupt industrial operations relying on RUGGEDCOM ROS devices. Critical manufacturing sectors, particularly those in energy, transportation, and utilities, are at risk. A successful attack could lead to:
- Temporary loss of device functionality, impacting network stability.
- Operational downtime, affecting productivity and safety.
- Potential cascading effects in environments where RUGGEDCOM devices manage critical infrastructure.
---
Mitigation Steps
Siemens has released version 5.10.1 to address this vulnerability. Users are urged to:
1. Update Immediately: Apply the latest firmware (v5.10.1 or later) to all affected devices.
2. Restrict Network Access: Isolate RUGGEDCOM devices from business networks and the internet. Use firewalls to limit exposure.
3. Enforce Authentication: Ensure only authorized personnel can access device web services.
4. Monitor for Exploitation: Deploy intrusion detection systems (IDS) to detect unusual activity.
5. Follow Siemens Guidelines: Adhere to Siemens’ [Operational Guidelines for Industrial Security](https://www.siemens.com/cert/operational-guidelines-industrial-security) for best practices.
For further assistance, contact Siemens ProductCERT via [their advisories page](https://www.siemens.com/cert/advisories).
---
Recommended Practices for Industrial Security
The Cybersecurity and Infrastructure Security Agency (CISA) recommends the following measures to minimize exploitation risks:
- Minimize Network Exposure: Ensure control system devices are not accessible from the internet.
- Use Secure Remote Access: Employ Virtual Private Networks (VPNs) for remote access, keeping them updated to the latest version.
- Isolate Critical Networks: Segment control system networks from business networks using firewalls.
- Perform Risk Assessments: Conduct impact analysis before deploying defensive measures.
- Leverage CISA Resources: Explore CISA’s [ICS Cybersecurity Best Practices](https://www.cisa.gov/ics) for proactive defense strategies.
---
Conclusion
The CVE-2025-40935 vulnerability in Siemens RUGGEDCOM ROS devices highlights the importance of proactive patch management and network security in industrial environments. While the flaw requires authenticated access, its potential to disrupt critical operations underscores the need for immediate action. Organizations using affected devices should update to version 5.10.1 or later and implement Siemens’ recommended security practices to mitigate risks.
For ongoing updates, monitor CISA advisories and Siemens ProductCERT communications.
---
References
[^1]: Siemens ProductCERT. "[SSA-763474: Denial of Service Vulnerability in RUGGEDCOM ROS](https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-015-05.json)". Retrieved 2025-01-24.
[^2]: CISA. "[ICS Advisory ICSA-26-015-05](https://www.cisa.gov/news-events/ics-advisories/icsa-26-015-05)". Retrieved 2025-01-24.
[^3]: MITRE. "[CWE-20: Improper Input Validation](https://cwe.mitre.org/data/definitions/20.html)". Retrieved 2025-01-24.