Field Notice: FN - 70489 from Cisco. PKI Self-Signed Certificate Expiration

Self-signed X.509 PKI certificates (SSC) that were generated on devices that run affected Cisco IOS® or Cisco IOS XE software releases expire on 2020-01-01 00:00:00 UTC. New self-signed certificates cannot be created on affected devices after 2020-01-01 00:00:00 UTC. Any service that relies on these self-signed certificates to establish or terminate a secure connection might not work after the certificate expires.

This issue affects only self-signed certificates that were generated by the Cisco IOS or Cisco IOS XE device and applied to a service on the device. Certificates that were generated by a Certificate Authority (CA), which includes those certificates generated by the Cisco IOS CA feature, are not impacted by this issue.

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https://www.cisco.com/c/en/us/support/docs/field-notices/704/fn70489.html

https://www.cisco.com/c/en/us/support/docs/security-vpn/public-key-infrastructure-pki/215118-ios-self-signed-certificate-expiration-o.html