Cisco published a security advisory on 08th April 2021, addressing vulnerabilities in the following products and the company stated that they will not release any software updates to address these vulnerabilities since the below products have entered the end-of-life process. It is recommended that you Replace these devices as soon as possible.
For more information on these Cisco update, you can follow the URL:
The Guyana National CIRT recommends that users and administrators to review the end-of-life notices for these product
PDF Download: Cisco Security Updates.pdf