What are the challenges associated with the Certificate Revocation List $($CRL$)$ system?

All modern browsers and applications are configured to check CRLs by default, eliminating any risk of accepting revoked cer

CRLs are only published once a year, making them largely ineffective.

CRLs guarantee that all clients will immediately know if a certificate is revoked or suspended.

There is a risk that a crrtificate might be revoked but still accepted by clients because an up$-$to$-$date CRL has not been publis the client application does not check the CRL$.$