CVE-2026-44104 Overview
CVE-2026-44104 is a firmware verification flaw affecting the basemodule of a charging controller. The update process validates only a CRC32 checksum and omits cryptographic signature verification. An unauthenticated remote attacker can push modified firmware to the device over the network. Successful exploitation results in full system compromise of the charging controller. The weakness is classified as Improper Verification of Cryptographic Signature [CWE-347]. Details were published by CERT-VDE in advisory VDE-2026-008.
Critical Impact
Unauthenticated remote attackers can install modified firmware on the charging controller, yielding full system compromise of confidentiality, integrity, and availability.
Affected Products
- Charging controller basemodule firmware update component (see vendor advisory)
- Refer to CERT-VDE Security Advisory VDE-2026-008 for the authoritative list of affected models and firmware versions
Discovery Timeline
- 2026-07-30 - CVE-2026-44104 published to NVD
- 2026-07-30 - Last updated in NVD database
Technical Details for CVE-2026-44104
Vulnerability Analysis
The charging controller accepts firmware images over the network and verifies image integrity using a CRC32 checksum. CRC32 is an error-detection algorithm, not a cryptographic primitive. Attackers can trivially recompute a valid CRC32 after tampering with the firmware payload. The device performs no signature check against a vendor-controlled public key. As a result, arbitrary firmware images are accepted as authentic. This condition maps to [CWE-347] Improper Verification of Cryptographic Signature.
Root Cause
The update routine treats data integrity and data authenticity as the same property. It validates that the image is not corrupted in transit but never validates who produced it. Without a signature check tied to a hardware or vendor-controlled trust anchor, any party that can reach the update interface can supply firmware. Cryptographic signature verification, typically using RSA or ECDSA over a SHA-2 digest, is absent from the basemodule update flow.
Attack Vector
An unauthenticated remote attacker with network access to the charging controller crafts a modified firmware image, recomputes the CRC32 value, and submits the image through the update interface. The controller accepts the image and reboots into attacker-supplied code. The attacker gains persistent control over the basemodule, including the ability to modify charging behavior, exfiltrate operational data, or pivot into connected operational technology networks.
No verified exploit code has been published for CVE-2026-44104. Refer to the CERT-VDE Security Advisory for authoritative technical details.
Detection Methods for CVE-2026-44104
Indicators of Compromise
- Unexpected firmware version strings or build identifiers reported by the charging controller after a maintenance window
- Reboot events on the basemodule that do not correlate with authorized change tickets
- Outbound network connections from the controller to hosts outside the operator's management range
Detection Strategies
- Baseline authorized firmware hashes and alert when the running image digest deviates from the approved manifest
- Inspect network traffic to controller update endpoints for firmware transfers originating from non-management subnets
- Correlate device-reported firmware update events with change management records to surface unauthorized flashes
Monitoring Recommendations
- Forward controller syslog and update-service logs into a centralized SIEM for retention and correlation
- Monitor the update service TCP port for connections from untrusted network segments
- Track configuration drift on charging controllers using periodic attestation of firmware and configuration hashes
How to Mitigate CVE-2026-44104
Immediate Actions Required
- Restrict network access to the charging controller's update interface using firewall rules or network segmentation
- Place the controller behind a management VPN and block direct exposure to untrusted networks
- Inventory affected devices against the CERT-VDE advisory and prioritize field patching
- Verify current firmware hashes against vendor-provided reference values
Patch Information
Consult the CERT-VDE Security Advisory VDE-2026-008 for the vendor's fixed firmware versions and update procedures. Deploy vendor-signed firmware that introduces cryptographic signature verification to the basemodule update process.
Workarounds
- Isolate charging controllers on a dedicated VLAN with strict ingress and egress access control lists
- Disable remote firmware update functionality where operationally feasible until fixed firmware is applied
- Require jump-host authentication and multi-factor authentication for any operator session that can reach the update interface
- Log and alert on all firmware update attempts, whether successful or failed
# Example firewall rule restricting update interface to a management subnet
iptables -A INPUT -p tcp --dport <update_port> -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport <update_port> -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
