How to downgrade Openssl on CentOS?

List the available versions by running this command:

yum --showduplicates list openssl


you should see these lines:

Installed package:
openssl.x86_641:1.0.1e42.el7.9

Available packages:
openssl.x86_64 - 1:1.0.1e-42.el7 - base
openssl.x86_64 - 1:1.0.1e-42.el7_1.5 - updates
openssl.x86_64 - 1:1.0.1e-42.el7.4 - updates
openssl.x86_64 - 1:1.0.1e-42.el7.6 - updates
openssl.x86_64 - 1:1.0.1e-42.el7.8 - updates
openssl.x86_64 - 1:1.0.1e-42.el7.9 - updates

then doing:

yum downgrade openssl-1.0.1e-42.el7_1.5

it will downgrade openssl to 7_1.5 version.