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I need 1.0.2 version of libssl, does somebody know how to downgrade from the newest 1.1.1 or download directly that version?

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  • If you want to support old ciphers, it is better to change the cipersuite configuration, for instance by setting "CipherString = DEFAULT@SECLEVEL=1" in "/etc/ssl/openssl.cnf"
    – mevdschee
    Feb 19, 2021 at 11:23

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Assuming you’re on amd64, you can download it from the Debian 9 repositories and install it:

wget http://deb.debian.org/debian/pool/main/o/openssl1.0/libssl1.0.2_1.0.2u-1~deb9u1_amd64.deb
sudo dpkg -i libssl1.0.2_1.0.2u-1~deb9u1_amd64.deb

This will install libssl 1.0.2 alongside 1.1.1, and software built against either will work. You shouldn’t try removing 1.1.1.

If you want to compile software looking for version 1.0.2, you‘ll need the development package too:

wget http://deb.debian.org/debian/pool/main/o/openssl1.0/libssl1.0-dev_1.0.2u-1~deb9u1_amd64.deb
sudo dpkg -i libssl1.0-dev_1.0.2u-1~deb9u1_amd64.deb

openssl is separate, and you should use the latest version:

sudo apt install openssl
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