openssl x509 -in cert.der -inform DER -text -noout
Furthermore, the sheer popularity of OpenSSL makes it a prime target for supply chain attacks. The vulnerability of 2014 was a wake-up call. On Windows, where auto-updating command-line tools is not standard practice (unlike Linux package managers), it is dangerously easy for a Windows server to be running a version of libssl that is years out of date. openssl for windows