Open Charge Point Protocol, or OCPP, is an application protocol used for communication between electric vehicle charging stations and a central management system. It carries messages for authorisation, charging status, meter values and remote control, usually over IP networks with JSON or XML payloads.
What OCPP Is Used For
Open Charge Point Protocol is the message layer that lets a charging station and a central management system coordinate authorisation, charging state, metering, and remote commands. It matters because the protocol sits on the control path for availability, billing accuracy, and operational trust.
In practice, OCPP is less about the physical charger and more about how the charger is managed at scale. That makes the protocol central to fleet operations, back-end integration, and the security boundary between field devices and the systems that govern them.
How OCPP Communication Works
OCPP is typically carried over IP networks and uses structured payloads such as JSON or XML. Because it is an application protocol, security depends not just on the protocol syntax, but on the transport, endpoint authentication, and the integrity of the systems that speak it.
The protocol’s functions are operationally sensitive: authorisation requests affect who can charge, status messages affect service visibility, meter values affect billing or settlement, and remote control can start or stop sessions. Any weakness in message handling can therefore have both technical and financial consequences.
For a broader view of how EV charging security fits together, including OCPP security profiles and back-end credentials, EV Charging Security Guide is the most directly relevant internal reference.
Security Considerations for OCPP Deployments
OCPP deployments must assume that the network is not inherently trusted. If chargers, management systems, or intermediaries are exposed to weak authentication, permissive network paths, or poor message validation, an attacker can tamper with commands, spoof device state, or disrupt charging operations.
Metering and authorisation messages also create integrity risk. A compromised or misconfigured endpoint can distort usage records, interfere with session control, or create denial-of-service conditions that are hard to distinguish from ordinary device failure.
Because OCPP is a protocol family rather than a single product, security posture varies across implementations. That is why operators should rely on vendor documentation and the protocol’s own specification history for exact capability and interoperability details, rather than assuming all OCPP deployments behave the same way.
Where OCPP Sits in the EV Charging Stack
OCPP is one part of a larger EV charging ecosystem that often includes charger hardware, a charge point management system, identity and payment services, firmware update channels, and sometimes smart-charging or roaming integrations. The protocol is the coordination layer that ties those components together.
That placement makes OCPP a boundary technology: it does not merely move data, it carries operational decisions between distributed assets and central control. As a result, security issues in the protocol can propagate into device availability, customer experience, fraud exposure, and downstream business processes.
For protocol-specific publication and registry context, the IANA registries are the authoritative place to verify internet protocol parameters and related identifiers.
Risk and Threat Considerations
OCPP is attractive to attackers because it can expose control over physical infrastructure through software pathways. If a charging network weakens transport security, authentication, or message validation, an adversary may interfere with sessions, manipulate metering, or create operational disruption across many chargers at once.
Failure mechanism: A compromised charger, management server, or exposed API path can be used to inject unauthorised commands, replay or alter messages, or degrade service through protocol abuse and trust boundary failure.
Impact: The result can be fraud, inaccurate billing, service outage, unsafe operational states, or loss of confidence in the charging estate, especially where the same back-end coordinates many distributed devices.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP API Security Top 10 addresses the attack and risk surface, while NIST SP 800-53 Rev 5, CIS Controls v8 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | IA-9 — Identification and Authentication (Non-Organizational Users) | OCPP chargers and back-end systems are external endpoints that must authenticate before exchanging control messages. |
| AC-6 — Least Privilege | Remote control and session actions in OCPP should be limited to the minimum authority needed. | |
| Recommendation — Require mutual authentication for charger-to-back-end sessions and reject unauthenticated protocol traffic. Restrict protocol operations so only approved systems can start, stop, or reconfigure charging sessions. | ||
| OWASP API Security Top 10 | API8 — Security Misconfiguration | OCPP implementations often expose networked control interfaces where weak defaults or transport settings create exposure. |
| Recommendation — Audit OCPP endpoints for weak defaults, insecure transport settings, and permissive exposure paths. | ||
| CIS Controls v8 | CIS-12 — Network Infrastructure Management | OCPP relies on networked field devices and management systems whose trust boundaries must be controlled. |
| Recommendation — Segment charger management traffic and tightly control the network paths used by OCPP systems. | ||
| NIST CSF 2.0 | PR.AA-05 — Network Integrity | OCPP security depends on protecting the integrity of network communications between chargers and management systems. |
| Recommendation — Protect OCPP communications with authenticated, integrity-checked network channels and monitored trust boundaries. | ||
Practitioner Guidance
Why practitioners should care: OCPP security is usually a system problem, not just a protocol problem. Operators need to treat charger identity, back-end access, and remote-control authority as part of the same trust model, because compromise at any one point can affect the whole estate.
Common misunderstanding: Teams sometimes assume that because OCPP is an open protocol, interoperability implies secure interoperability. In reality, secure operation depends on how each implementation handles authentication, certificate use, transport protection, and remote command governance.
Practitioner takeaway: Validate OCPP security at the architecture level, then confirm that device onboarding, command authorisation, and operational monitoring are consistent across every charger and management integration.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on October 29, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org