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Siemens RUGGEDCOM APE1808 Devices Vulnerabilities

CISA Cybersecurity Advisories

Published March 12th, 2026

Detected March 13th, 2026

Summary

CISA has issued an advisory regarding multiple vulnerabilities affecting Siemens RUGGEDCOM APE1808 devices. These vulnerabilities, related to HTTP request smuggling and authentication bypass, have been assigned high CVSS scores. Siemens recommends updating to the latest version to address these security risks.

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What changed

CISA has released an advisory (ICSA-26-071-02) detailing critical vulnerabilities affecting Siemens RUGGEDCOM APE1808 devices. The vulnerabilities, including HTTP Request Smuggling and Authentication Bypass, stem from underlying issues in Fortinet FortiOS and have been assigned CVSS scores up to 9.8. Affected sectors include Critical Manufacturing, Energy, and Transportation Systems.

Siemens has released a new version for the RUGGEDCOM APE1808 devices and strongly recommends updating to the latest version. Affected entities should consult the provided Siemens security advisory (SSA-975644) for detailed remediation steps and mitigation strategies. Failure to update may leave critical infrastructure systems exposed to potential cyberattacks.

What to do next

Review Siemens security advisory SSA-975644 for detailed remediation and mitigation steps.
Update Siemens RUGGEDCOM APE1808 devices to the latest recommended version.
Assess potential impact on critical infrastructure sectors including manufacturing, energy, and transportation.

Source document (simplified)

ICS Advisory

Siemens RUGGEDCOM APE1808 Devices

Release Date

March 12, 2026

Alert Code ICSA-26-071-02 Related topics: Industrial Control System Vulnerabilities, Industrial Control Systems View CSAF

Summary

Fortinet has published information on vulnerabilities in FORTIOS. This advisory lists the related Siemens Industrial products. Siemens has released a new version for RUGGEDCOM APE1808 and recommends to update to the latest version.

The following versions of Siemens RUGGEDCOM APE1808 Devices are affected:

RUGGEDCOM APE1808 vers:all/, vers:all/ (CVE-2026-24858, CVE-2025-55018, CVE-2025-62439, CVE-2025-64157)

| CVSS | Vendor | Equipment | Vulnerabilities |
| --- | --- | --- | --- |
| v3 9.8 | Siemens | Siemens RUGGEDCOM APE1808 Devices | Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling'), Improper Verification of Source of a Communication Channel, Use of Externally-Controlled Format String, Authentication Bypass Using an Alternate Path or Channel |

Background

Critical Infrastructure Sectors: Critical Manufacturing, Energy, Transportation Systems
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany

Vulnerabilities

Expand All +

CVE-2025-55018

An inconsistent interpretation of http requests ('http request smuggling') vulnerability in Fortinet FortiOS 7.6.0, FortiOS 7.4.0 through 7.4.9, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4.3 through 6.4.16 may allow an unauthenticated attacker to smuggle an unlogged http request through the firewall policies via a specially crafted header

View CVE Details

Affected Products

Siemens RUGGEDCOM APE1808 Devices

Vendor:
Siemens Product Version:
RUGGEDCOM APE1808 Product Status:
known_affected

Remediations

Vendor fix
Update Fortigate NGFW to V7.4.10 or later version. Contact customer support to receive patch and update information.

Mitigation
For more information see the associated Siemens security advisory SSA-975644 in HTML https://cert-portal.siemens.com/productcert/html/ssa-975644.html

Mitigation
For more information see the associated Siemens security advisory SSA-975644 in CSAF https://cert-portal.siemens.com/productcert/csaf/ssa-975644.json

Relevant CWE: CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Metrics

| CVSS Version | Base Score | Base Severity | Vector String |
| --- | --- | --- | --- |
| 3.1 | 5.8 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N |

CVE-2025-62439

View CVE Details

Affected Products

Siemens RUGGEDCOM APE1808 Devices

Vendor:
Siemens Product Version:
RUGGEDCOM APE1808 Product Status:
known_affected

Remediations

Vendor fix
Update Fortigate NGFW to V7.4.10 or later version with FSSO TS Agent version 5.0 build 0324 or later version. Contact customer support to receive patch and update information.

Mitigation
For more information see the associated Siemens security advisory SSA-975644 in HTML https://cert-portal.siemens.com/productcert/html/ssa-975644.html

Mitigation
For more information see the associated Siemens security advisory SSA-975644 in CSAF https://cert-portal.siemens.com/productcert/csaf/ssa-975644.json

Relevant CWE: CWE-940 Improper Verification of Source of a Communication Channel

Metrics

| CVSS Version | Base Score | Base Severity | Vector String |
| --- | --- | --- | --- |
| 3.1 | 4.2 | MEDIUM | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N |

CVE-2025-64157

A use of externally-controlled format string vulnerability in Fortinet FortiOS 7.6.0 through 7.6.4, FortiOS 7.4.0 through 7.4.9, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0 all versions allows an authenticated admin to execute unauthorized code or commands via specifically crafted configuration.

View CVE Details

Affected Products

Siemens RUGGEDCOM APE1808 Devices

Vendor:
Siemens Product Version:
RUGGEDCOM APE1808 Product Status:
known_affected

Remediations

Vendor fix
Update Fortigate NGFW to V7.4.10 or later version. Contact customer support to receive patch and update information.

Mitigation
For more information see the associated Siemens security advisory SSA-975644 in HTML https://cert-portal.siemens.com/productcert/html/ssa-975644.html

Mitigation
For more information see the associated Siemens security advisory SSA-975644 in CSAF https://cert-portal.siemens.com/productcert/csaf/ssa-975644.json

Relevant CWE: CWE-134 Use of Externally-Controlled Format String

Metrics

| CVSS Version | Base Score | Base Severity | Vector String |
| --- | --- | --- | --- |
| 3.1 | 6.7 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |

CVE-2026-24858

An authentication bypass using an alternate path or channel vulnerability in Fortinet FortiAnalyzer 7.6.0 through 7.6.5, FortiAnalyzer 7.4.0 through 7.4.9, FortiAnalyzer 7.2.0 through 7.2.11, FortiAnalyzer 7.0.0 through 7.0.15, FortiManager 7.6.0 through 7.6.5, FortiManager 7.4.0 through 7.4.9, FortiManager 7.2.0 through 7.2.11, FortiManager 7.0.0 through 7.0.15, FortiOS 7.6.0 through 7.6.5, FortiOS 7.4.0 through 7.4.10, FortiOS 7.2.0 through 7.2.12, FortiOS 7.0.0 through 7.0.18 may allow an attacker with a FortiCloud account and a registered device to log into other devices registered to other accounts, if FortiCloud SSO authentication is enabled on those devices.

View CVE Details

Affected Products

Siemens RUGGEDCOM APE1808 Devices

Vendor:
Siemens Product Version:
RUGGEDCOM APE1808 Product Status:
known_affected

Remediations

Vendor fix
Update Fortigate NGFW to V7.4.11 or later version. Contact customer support to receive patch and update information.

Mitigation
For more information see the associated Siemens security advisory SSA-975644 in HTML https://cert-portal.siemens.com/productcert/html/ssa-975644.html

Mitigation
For more information see the associated Siemens security advisory SSA-975644 in CSAF https://cert-portal.siemens.com/productcert/csaf/ssa-975644.json

Relevant CWE: CWE-288 Authentication Bypass Using an Alternate Path or Channel

Metrics

| CVSS Version | Base Score | Base Severity | Vector String |
| --- | --- | --- | --- |
| 3.1 | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |

Acknowledgments

Siemens reported these vulnerabilities to CISA.

General Recommendations

As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity

Additional Resources

For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories

Terms of Use

The use of Siemens Security Advisories is subject to the terms and conditions listed on: https://www.siemens.com/productcert/terms-of-use.

Legal Notice and Terms of Use

This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).

Recommended Practices

CISA recommends users take defensive measures to minimize the exploitation risk of this vulnerability.

Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet.

Locate control system networks and remote devices behind firewalls and isolate them from business networks.

When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most recent version available. Also recognize VPN is only as secure as its connected devices.

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.

Advisory Conversion Disclaimer

This ICSA is a verbatim republication of Siemens ProductCERT SSA-975644 from a direct conversion of the vendor's Common Security Advisory Framework (CSAF) advisory. This is republished to CISA's website as a means of increasing visibility and is provided "as-is" for informational purposes only. CISA is not responsible for the editorial or technical accuracy of republished advisories and provides no warranties of any kind regarding any information contained within this advisory. Further, CISA does not endorse any commercial product or service. Please contact Siemens ProductCERT directly for any questions regarding this advisory.

Revision History

Initial Release Date: 2026-03-10

| Date | Revision | Summary |
| --- | --- | --- |
| 2026-03-10 | 1 | Publication Date |
| 2026-03-12 | 2 | Initial CISA Republication of Siemens ProductCERT SSA-975644 advisory |