An issue was discovered in Dalmann OCPP.Core before 1.3.0 for OCPP (Open Charge Point Protocol) for electric vehicles. It permits multiple transactions with the same connectorId and idTag, contrary to the expected ConcurrentTx status. This could result in critical transaction management and billing errors. NOTE: the vendor's perspective is "Imagine you've got two cars in your family and want to charge both in parallel on the same account/token? Why should that be rejected?"
Conclusion & alert: CVE-2023-49957 is rated High Exploit Risk (63.6/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.30%). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2025-11-21 | 0.18% | 0.30% | +0.12% |
| 2 | 2025-11-18 | 0.30% | 0.18% | -0.12% |
| 3 | 2025-04-15 | — | 0.30% | — |
Full EPSS history (6 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| dallmann-consulting | open_charge_point_protocol | < 1.3.0 | cpe:2.3:a:dallmann-consulting:open_charge_point_protocol:*:*:*:*:*:*:*:* |
| URL | Tags |
|---|---|
| https://github.com/dallmann-consulting/OCPP.Core/issues/35 | Exploit Issue Tracking Vendor Advisory |