CVE-2025-27769 Overview
A vulnerability has been identified in Heliox EV Charging Stations that allows improper access control, potentially enabling an attacker with physical access to reach unauthorized services via the charging cable. This firmware vulnerability affects industrial EV charging infrastructure and could allow unauthorized access to internal services on the affected devices.
Critical Impact
Physical attackers with access to the charging cable can potentially access unauthorized services on vulnerable Heliox EV charging stations, posing risks to charging infrastructure security.
Affected Products
- Heliox Flex 180 kW EV Charging Station (All versions < F4.11.1)
- Heliox Mobile DC 40 kW EV Charging Station (All versions < L4.10.1)
Discovery Timeline
- 2026-03-10 - CVE CVE-2025-27769 published to NVD
- 2026-03-11 - Last updated in NVD database
Technical Details for CVE-2025-27769
Vulnerability Analysis
This vulnerability is classified under CWE-923 (Improper Restriction of Communication Channel to Intended Endpoints), indicating that the affected Heliox EV charging stations fail to properly restrict access to internal services. The physical attack vector means an attacker must have direct access to the charging infrastructure, specifically through the charging cable interface.
The improper access control implementation allows unintended communication pathways to be established, potentially exposing internal services that should not be accessible through the charging interface. While the vulnerability requires physical proximity, it represents a significant concern for public charging infrastructure where physical access may be relatively easy to obtain.
Root Cause
The root cause lies in improper access control mechanisms within the firmware of affected Heliox EV charging stations. The devices fail to adequately restrict which services can be accessed through the charging cable interface, allowing potential exposure of unauthorized services to attackers with physical access.
Attack Vector
Exploitation requires physical access to the charging station, specifically through the charging cable interface. An attacker would need to connect to the charging cable and leverage the improper access controls to reach services that should be restricted. The attack does not require authentication or user interaction, though the physical access requirement significantly limits the attack surface.
The vulnerability allows for limited confidentiality impact on both the vulnerable system and potentially connected downstream systems. No code examples are available for this vulnerability - refer to the Siemens Security Advisory SSA-126399 for detailed technical information.
Detection Methods for CVE-2025-27769
Indicators of Compromise
- Unexpected network traffic or connection attempts originating from the charging station's internal interfaces
- Anomalous service access patterns or authentication attempts on internal services
- Unusual communication activity through the charging cable interface
- Logs indicating access to services not normally exposed to charging interfaces
Detection Strategies
- Monitor charging station logs for unexpected service access attempts or anomalous connection patterns
- Implement network monitoring to detect unusual traffic patterns from charging infrastructure
- Deploy intrusion detection systems configured to alert on unauthorized access attempts to internal services
- Conduct regular firmware audits to verify charging stations are running patched versions
Monitoring Recommendations
- Establish baseline network behavior for charging stations and alert on deviations
- Implement physical security monitoring around charging infrastructure
- Enable comprehensive logging on charging station management interfaces
- Configure alerts for any attempts to access non-standard services through charging interfaces
How to Mitigate CVE-2025-27769
Immediate Actions Required
- Upgrade Heliox Flex 180 kW EV Charging Station firmware to version F4.11.1 or later
- Upgrade Heliox Mobile DC 40 kW EV Charging Station firmware to version L4.10.1 or later
- Implement physical security measures to restrict unauthorized access to charging infrastructure
- Review and audit current charging station deployments for affected firmware versions
Patch Information
Siemens has released updated firmware versions that address this vulnerability. Organizations should upgrade to the following minimum versions:
- Heliox Flex 180 kW: Update to firmware version F4.11.1 or later
- Heliox Mobile DC 40 kW: Update to firmware version L4.10.1 or later
For detailed patch information and firmware downloads, refer to the Siemens Security Advisory SSA-126399.
Workarounds
- Implement physical access controls to restrict unauthorized access to charging stations and cables
- Deploy network segmentation to isolate charging infrastructure from sensitive networks
- Monitor physical access points and implement surveillance around charging stations
- Consider temporary service restrictions on charging stations until firmware updates can be applied
# Firmware verification example
# Verify current firmware version on Heliox charging stations
# Access the management interface and check version information
# Flex 180 kW: Ensure version >= F4.11.1
# Mobile DC 40 kW: Ensure version >= L4.10.1
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
