CVE-2025-5830

Q: What is the severity of CVE-2025-5830?

CVE-2025-5830 has a CVSS score of 8.8 (HIGH). This vulnerability allows network-adjacent attackers to execute arbitrary code on Autel MaxiCharger AC Wallbox Commercial EV chargers without authentication. The heap-based buffer overflow in DLB_SlaveRegister message handling enables remote code execution on affected devices. EV charging station operators and facilities using these chargers are at risk.

8.8 HIGH

Remote Code Execution Buffer Overflow

📋 TL;DR

This vulnerability allows network-adjacent attackers to execute arbitrary code on Autel MaxiCharger AC Wallbox Commercial EV chargers without authentication. The heap-based buffer overflow in DLB_SlaveRegister message handling enables remote code execution on affected devices. EV charging station operators and facilities using these chargers are at risk.

💻 Affected Systems

Products:

Autel MaxiCharger AC Wallbox Commercial EV Chargers

Versions: Specific versions not publicly detailed in advisory

Operating Systems: Embedded firmware

Default Config Vulnerable: ⚠️ Yes

Notes: All network-connected installations are vulnerable by default. Authentication is not required for exploitation.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete compromise of EV charging infrastructure allowing attackers to disrupt charging operations, manipulate billing data, pivot to internal networks, or cause physical damage to vehicles/equipment.

🟠

Likely Case

Attackers gain control of charging stations to disrupt operations, steal electricity, or use as foothold for further network attacks.

🟢

If Mitigated

Isolated charging network segments prevent lateral movement, limiting impact to charging availability disruption.

🌐 Internet-Facing: HIGH

🏢 Internal Only: HIGH

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

No authentication required and network-adjacent access makes exploitation straightforward for skilled attackers.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Not specified in public advisory

Vendor Advisory: https://www.zerodayinitiative.com/advisories/ZDI-25-349/

Restart Required: Yes

Instructions:

1. Contact Autel for firmware update 2. Download latest firmware from Autel portal 3. Apply update via management interface 4. Reboot charger to activate patch

🔧 Temporary Workarounds

Network Segmentation

all

Isolate EV charging network from critical infrastructure and internet

Access Control Lists

all

Restrict network access to chargers from authorized management systems only

🧯 If You Can't Patch

Physically disconnect chargers from network and use local management only
Implement strict firewall rules allowing only essential traffic to/from chargers

🔍 How to Verify

Check if Vulnerable:

Check firmware version against vendor's patched version list. If unable to verify, assume vulnerable.

Check Version:

Check via charger's web interface or management system for firmware version

Verify Fix Applied:

Confirm firmware version matches or exceeds vendor's patched version. Test connectivity to verify functionality.

📡 Detection & Monitoring

Log Indicators:

Unusual network traffic to chargers
Multiple failed connection attempts
Unexpected firmware modification alerts

Network Indicators:

Unusual DLB_SlaveRegister message patterns
Traffic from unexpected sources to charger ports
Abnormal protocol behavior

SIEM Query:

source_ip NOT IN (authorized_management_ips) AND dest_port IN (charger_ports) AND protocol='DLB'

📊 Metadata

CVE ID: CVE-2025-5830

CVSS v3 Score: 8.8 (HIGH)

CVSS Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-122

EPSS Score: 0.06% exploit probability (19.6th percentile)

Published: June 25, 2025

Last Updated: September 10, 2025

🔗 References

https://www.zerodayinitiative.com/advisories/ZDI-25-349/ Third Party Advisory