CVE-2026-22540 Overview
CVE-2026-22540 is a critical denial of service vulnerability affecting electric vehicle (EV) charger infrastructure. The vulnerability allows attackers to cause a denial of service condition on the charger's control board through massive ARP (Address Resolution Protocol) request flooding. Since the control board is responsible for managing EV interfaces and is essential for proper charger operation, successful exploitation renders the entire charging station inoperable.
Critical Impact
Attackers can remotely disable EV charging stations through network-based ARP flooding attacks, potentially disrupting critical charging infrastructure and causing service outages across charging networks.
Affected Products
- EV charger control boards with network connectivity
- Charging station management systems vulnerable to ARP flooding
- EV interface controllers exposed to network traffic
Discovery Timeline
- 2026-01-07 - CVE CVE-2026-22540 published to NVD
- 2026-01-08 - Last updated in NVD database
Technical Details for CVE-2026-22540
Vulnerability Analysis
This vulnerability is classified under CWE-400 (Uncontrolled Resource Consumption), indicating that the affected control board lacks adequate protections against resource exhaustion attacks. The EV charger's network-facing control board fails to implement proper rate limiting or filtering mechanisms for incoming ARP requests, allowing an attacker to overwhelm the device's processing capabilities.
When the control board is flooded with ARP requests, it becomes unable to process legitimate network traffic and perform its critical functions of managing EV charging interfaces. Since the charger's operation depends on this board functioning correctly, the entire charging station becomes non-functional during the attack.
Root Cause
The root cause of CVE-2026-22540 stems from insufficient resource consumption controls in the ARP request handling mechanism of the EV charger control board. The device accepts and attempts to process all incoming ARP requests without implementing throttling, filtering, or queue management mechanisms. This design flaw allows malicious actors to consume all available processing resources by sending a high volume of ARP packets.
Attack Vector
The attack can be executed remotely over the network (AV:N) with low complexity (AC:L) and requires no authentication (PR:N) or user interaction (UI:N). An attacker with network access to the EV charger's control board segment can initiate the attack by flooding the device with ARP requests using standard network tools.
The attack involves sending a massive number of ARP requests targeting the control board's network interface. As the board attempts to process each request, its resources become exhausted, leading to denial of service. The attack affects both the vulnerable system's availability and can have subsequent downstream impacts on connected systems and the overall charging infrastructure.
Detection Methods for CVE-2026-22540
Indicators of Compromise
- Abnormally high volume of ARP traffic directed at EV charger control boards
- Sudden unavailability of EV charging stations without apparent hardware failure
- Network interface statistics showing ARP request flooding patterns
- Control board becoming unresponsive to legitimate management traffic
Detection Strategies
- Deploy network monitoring to detect anomalous ARP traffic volumes targeting charging infrastructure
- Implement IDS/IPS rules to identify and alert on ARP flooding patterns
- Monitor EV charger availability metrics for unexpected service disruptions
- Configure SIEM alerts for unusual ARP request rates on charging network segments
Monitoring Recommendations
- Establish baseline ARP traffic patterns for normal charging station operations
- Implement real-time network traffic analysis at charging infrastructure network boundaries
- Deploy SNMP or similar monitoring for control board health and responsiveness
- Create dashboards to visualize charging station availability across the network
How to Mitigate CVE-2026-22540
Immediate Actions Required
- Isolate EV charger control boards on dedicated network segments with controlled access
- Implement ARP rate limiting at network switch or firewall level
- Deploy network access control to restrict which devices can communicate with charging infrastructure
- Enable ARP inspection features on network switches where available
Patch Information
Organizations should consult the Thales Group Security Resources for the latest security updates and firmware patches addressing this vulnerability. Contact the EV charger vendor directly for device-specific remediation guidance and patch availability.
Workarounds
- Configure network switches to implement dynamic ARP inspection (DAI) to validate ARP packets
- Deploy rate limiting rules on network devices to restrict ARP traffic volume
- Use VLANs to segment charging infrastructure from general network traffic
- Implement access control lists (ACLs) to restrict network access to charging equipment
- Consider deploying dedicated security appliances to filter malicious traffic before it reaches charging infrastructure
# Example network switch configuration for ARP rate limiting
# Cisco IOS example - adapt for your specific equipment
interface GigabitEthernet0/1
description EV_Charger_Connection
ip arp inspection limit rate 15
switchport access vlan 100
switchport port-security maximum 2
spanning-tree portfast
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
