SSA-515903

Siemens Security Advisory by Siemens ProductCERT

SSA-515903: Multiple Vulnerabilities in SiPass integrated AC5102 / ACC-G2 and ACC-AP

Publication Date:	2025-03-11
Last Update:	2025-03-11
Current Version:	V1.0
CVSS v3.1 Base Score:	9.1
CVSS v4.0 Base Score:	9.4

SUMMARY

SiPass integrated ACC (Advanced Central Controller) devices contain multiple vulnerabilities that could allow attackers to execute commands on the devices with root privileges and access sensitive data.

Siemens has released new versions for the affected products and recommends to update to the latest versions.

AFFECTED PRODUCTS AND SOLUTION

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Affected Product and Versions	Remediation
SiPass integrated AC5102 (ACC-G2)	Open for details See further recommendations from section Workarounds and Mitigations
SiPass integrated AC5102 (ACC-G2) All versions < V6.4.8 affected by CVE-2024-52285	Update to V6.4.8 or later version See further recommendations from section Workarounds and Mitigations
SiPass integrated AC5102 (ACC-G2) All versions < V6.4.9 affected by multiple CVEs CVE-2025-27493 CVE-2025-27494	Update to V6.4.9 or later version See further recommendations from section Workarounds and Mitigations
SiPass integrated ACC-AP	Open for details See further recommendations from section Workarounds and Mitigations
SiPass integrated ACC-AP All versions < V6.4.8 affected by CVE-2024-52285	Update to V6.4.8 or later version See further recommendations from section Workarounds and Mitigations
SiPass integrated ACC-AP All versions < V6.4.9 affected by multiple CVEs CVE-2025-27493 CVE-2025-27494	Update to V6.4.9 or later version See further recommendations from section Workarounds and Mitigations

WORKAROUNDS AND MITIGATIONS

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

CVE-2025-27493, CVE-2025-27494: Set an individual strong password for the administrator account ("SIEMENS")

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

GENERAL SECURITY RECOMMENDATIONS

As a general security measure Siemens strongly recommends to protect network access to affected products with appropriate mechanisms. It is advised to follow recommended security practices in order to run the devices in a protected IT environment.

PRODUCT DESCRIPTION

ACC-AP (Advanced Central Controller) is a door controller for up to two doors connected to an Internet/Intranet network for communication with the SiPass integrated access control system.

AC5102 / ACC-G2 (Advanced Central Controller) is the central controller for SiPass integrated access control systems.

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-2024-52285

Affected devices expose several MQTT URLs without authentication. This could allow an unauthenticated remote attacker to access sensitive data.

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:L/I:N/A:N
CVSS v4.0 Base Score	6.9
CVSS v4.0 Vector	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CWE	CWE-306: Missing Authentication for Critical Function

Vulnerability CVE-2025-27493

Affected devices improperly sanitize user input for specific commands on the telnet command line interface. This could allow an authenticated local administrator to escalate privileges by injecting arbitrary commands that are executed with root privileges.

CVSS v3.1 Base Score	8.2
CVSS v3.1 Vector	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0 Base Score	9.3
CVSS v4.0 Vector	CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CWE	CWE-20: Improper Input Validation

Vulnerability CVE-2025-27494

Affected devices improperly sanitize input for the pubkey endpoint of the REST API. This could allow an authenticated remote administrator to escalate privileges by injecting arbitrary commands that are executed with root privileges.

CVSS v3.1 Base Score	9.1
CVSS v3.1 Vector	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0 Base Score	9.4
CVSS v4.0 Vector	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CWE	CWE-20: Improper Input Validation

ACKNOWLEDGMENTS

Siemens thanks the following party for its efforts:

Airbus Security for reporting the vulnerabilities

ADDITIONAL INFORMATION

Firmware version V6.4.8 was initially released as part of SiPass integrated V2.95 IR12.
Firmware version V6.4.9 was initially released as part of SiPass integrated V2.95 IR14.

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 (2025-03-11):

Publication Date

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