  The deployment of electric vehicle charging infrastructure is occurring at a
rapid pace. Simultaneously, existing standards, such as ISO 15118, which
defines critical charging communication, are being improved and further
developed. In this paper, we conduct a measurement study of already deployed DC
charging stations to analyze the current state of deployment for various
protocols. We present the adoption of TLS, and various EV charging protocols
with a direct security impact, as well as observations about the Signal Level
Attenuation Characterization (SLAC) process, and encryption keys.
  Our results indicate that even recently installed charging stations (December
2023) do not adhere to the latest version of the standard, leaving them
vulnerable to attacks. We found that 84% of the surveyed charging stations do
not implement Transport Layer Security (TLS), and are thus unable to implement
the latest versions of the ISO 15118 protocol, leaving them vulnerable to
attacks already demonstrated years ago. Finally, we observe and document
anomalous behavior and violations of the standard.
