SSA-127084

Siemens Security Advisory by Siemens ProductCERT

SSA-127084: Multiple Vulnerabilities in Fortigate NGFW before V7.6.7 on RUGGEDCOM APE1808 Devices

Publication Date:	2026-08-11
Last Update:	2026-10-13
Current Version:	V1.1
CVSS v3.1 Base Score:	8.1

SUMMARY

Fortinet has published information on vulnerabilities in FortiOS. This advisory lists the related Siemens Industrial products.

Siemens recommends to contact customer support for additional information, and follow Fortinet advisory for workarounds and mitigation measures.

KNOWN AFFECTED PRODUCTS

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Affected Product and Versions	Remediation
RUGGEDCOM APE1808 All versions with Fortinet NGFW affected by all CVEs CVE-2026-23573 CVE-2026-59839 CVE-2026-71408 CVE-2026-71407 CVE-2026-84393	Update Fortigate NGFW to V7.6.7 or later following the secure update recommendation procedure. Contact customer support to receive detailed information

MITIGATIONS

Product-specific remediations or mitigations can be found in the section Known Affected Products.
Please follow the General Security Recommendations.

GENERAL SECURITY 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

PRODUCT DESCRIPTION

RUGGEDCOM APE1808 is a powerful utility-grade application hosting platform that lets you deploy a range of commercially available applications for edge computing and cybersecurity in harsh, industrial environments.

VULNERABILITY DESCRIPTION

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This chapter describes all vulnerabilities (CVE-IDs) addressed in this security advisory. Wherever applicable, it also documents the product-specific impact of the individual vulnerabilities.

Vulnerability CVE-2026-23573

An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability [CWE-79] in FortiOS, FortiProxy, FortiPAM and FortiSwitch-Manager Agentless SSL-VPN may allow an authenticated remote user to execute code or commands via crafted requests

CVSS v3.1 Base Score	6.1
CVSS v3.1 Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE	CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Vulnerability CVE-2026-59839

An Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability [CWE-22] in FortiOS, FortiPAM, FortiProxy and FortiSwitch Manager may allow a privileged authenticated attacker with physical access to the device to delete the file system via crafted CLI commands

CVSS v3.1 Base Score	5.5
CVSS v3.1 Vector	CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
CWE	CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Vulnerability CVE-2026-71407

A Stack-based Buffer Overflow vulnerability [CWE-121] vulnerability in Fortinet FortiOS 7.6.1 through 7.6.6 may allow an unauthenticated attacker who can bypass stack protection and ASLR to execute arbitrary code or commands in the context of the WAD daemon via crafted sockets, only if the explicit proxy is configured with Kerberos authentication and SOCKS enabled.

CVSS v3.1 Base Score	5.6
CVSS v3.1 Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
CWE	CWE-121: Stack-based Buffer Overflow

Vulnerability CVE-2026-71408

An Allocation of Resources Without Limits or Throttling vulnerability [CWE-770] in FortiOS may allow an unauthenticated attacker to perform a slow HTTP DoS attack on the web interface via crafted HTTP requests

CVSS v3.1 Base Score	5.3
CVSS v3.1 Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE	CWE-770: Allocation of Resources Without Limits or Throttling

Vulnerability CVE-2026-84393

An improper certificate validation vulnerability [CWE-295] in FortiOS and FortiProxy Agentless ZTNA portal may allow a remote and unauthenticated attacker to perform a Man-in-the-Middle attack on the communication channel between the ZTNA portal and the backend destination website

CVSS v3.1 Base Score	8.1
CVSS v3.1 Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE	CWE-297: Improper Validation of Certificate with Host Mismatch

ADDITIONAL INFORMATION

Siemens recommends to consult and implement the workarounds provided in Fortinet's upstream security notifications. Fortinet provides a public RSS feed for their security alerts to which customers can also subscribe [1].

[1] https://filestore.fortinet.com/fortiguard/rss/ir.xml

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

HISTORY DATA

V1.0 (2026-08-11):	Publication Date
V1.1 (2026-10-13):	Added CVE-2026-71408, CVE-2026-71407 and CVE-2026-84393

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