CVE-2025-55705: Charging Station Auth Bypass Vulnerability

CVE-2025-55705 Overview

CVE-2025-55705 is a session management vulnerability that occurs when electric vehicle charging station backend systems permit multiple simultaneous connections using the same charging station ID. This insufficient session expiration flaw (CWE-613) enables attackers to establish concurrent unauthorized sessions by reusing valid charging station identifiers, potentially leading to unauthorized access, data inconsistency, and manipulation of charging sessions.

Critical Impact

Attackers can exploit weak session management to establish multiple unauthorized connections to charging infrastructure backends, potentially disrupting service, manipulating billing data, or gaining unauthorized access to operational technology systems.

Affected Products

• Electric Vehicle Charging Station Backend Systems
• OCPP (Open Charge Point Protocol) Implementations
• Charging Station Management Platforms

Discovery Timeline

• 2026-01-22 - CVE CVE-2025-55705 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-55705

Vulnerability Analysis

This vulnerability stems from inadequate session management controls within charging station backend systems. The fundamental issue is that the system fails to enforce uniqueness constraints on active connections, allowing multiple sessions to be established using identical charging station identifiers. This architectural weakness bypasses the expected one-to-one relationship between a physical charging station and its backend connection.

The lack of proper session expiration mechanisms compounds the problem. When sessions are not properly invalidated or expired, attackers can leverage previously authenticated station IDs to maintain persistent unauthorized access. This is particularly concerning in Industrial Control Systems (ICS) environments where charging infrastructure interfaces with critical grid components.

From an exploitation standpoint, an attacker with knowledge of a valid charging station ID can establish parallel connections to the backend, effectively impersonating or shadowing a legitimate charging station. This could allow manipulation of charging session data, fraudulent billing activities, or denial of service to legitimate users.

Root Cause

The root cause is insufficient session expiration control (CWE-613) combined with missing validation of concurrent session uniqueness. The backend system does not properly track active sessions per charging station ID, nor does it implement adequate session timeout and invalidation logic. This allows the same identifier to maintain multiple active sessions simultaneously, violating the principle of session integrity.

Attack Vector

The attack vector is network-based, requiring no authentication or user interaction. An attacker can exploit this vulnerability remotely by:

1. Obtaining or discovering a valid charging station ID through reconnaissance or interception
2. Establishing a connection to the backend using this ID while the legitimate station is connected
3. Maintaining multiple concurrent sessions to intercept, modify, or inject commands
4. Potentially manipulating charging session data, billing information, or operational parameters

The vulnerability manifests in the session establishment and management logic of the backend system. When a connection request arrives with a charging station ID, the system fails to verify whether an active session already exists for that identifier. Technical details are available in the CISA ICS Advisory and the GitHub CSAF File.

Detection Methods for CVE-2025-55705

Indicators of Compromise

• Multiple concurrent WebSocket or TCP connections from different IP addresses using the same charging station ID
• Anomalous session counts per charging station identifier exceeding expected thresholds
• Connection attempts with known charging station IDs originating from unexpected geographic locations or IP ranges
• Sudden increases in session establishment rates for individual station identifiers

Detection Strategies

• Implement logging and alerting for duplicate charging station ID connections across the backend infrastructure
• Deploy network monitoring to identify multiple simultaneous connections using identical station identifiers
• Create correlation rules in SIEM platforms to detect session anomalies based on expected one-to-one station-to-connection ratios
• Monitor for unusual patterns in OCPP message traffic that may indicate session hijacking attempts

Monitoring Recommendations

• Enable detailed session logging including source IP, connection timestamps, and station IDs for all backend connections
• Implement real-time dashboards tracking active sessions per charging station ID with threshold-based alerts
• Configure network segmentation monitoring to detect unauthorized access attempts to OT/ICS network segments
• Establish baseline connection patterns for each charging station to facilitate anomaly detection

How to Mitigate CVE-2025-55705

Immediate Actions Required

• Audit current backend configurations to identify systems vulnerable to concurrent session exploitation
• Implement session uniqueness validation to prevent multiple simultaneous connections per charging station ID
• Enable enhanced logging on all charging station backend systems to track connection attempts and session states
• Review network segmentation between IT and OT environments to limit potential attack surface

Patch Information

Organizations should consult vendor-specific guidance for patching information. The CISA ICS Advisory provides additional technical details and vendor coordination information. Contact your charging station management platform vendor for applicable security updates that address session management vulnerabilities.

Workarounds

• Implement network-level access controls to restrict backend connections to known, authorized IP addresses or ranges
• Deploy application-layer session validation that terminates existing sessions when duplicate station ID connections are detected
• Configure session timeout policies to automatically expire idle connections and reduce the window of opportunity for exploitation
• Enable mutual TLS authentication between charging stations and backend systems to strengthen station identity verification

# Example: Implement connection rate limiting and session validation (conceptual)
# Configure firewall rules to limit connections per source
iptables -A INPUT -p tcp --dport 8080 -m connlimit --connlimit-above 1 --connlimit-mask 32 -j REJECT

# Enable session logging for audit purposes
echo "session.logging.enabled=true" >> /etc/charging-backend/config.properties
echo "session.duplicate.detection=enforce" >> /etc/charging-backend/config.properties