I was able to install libc6 2.17 in Debian Wheezy by editing the recommendations in perror's answer:

IMPORTANT

You need to exit out of your display manager by pressing CTRL+ALT+F1. Then you can stop x (slim) with sudo /etc/init.d/slim stop

(replace slim with mdm or lightdm or whatever)

Add the following line to the file /etc/apt/sources.list:

deb http://ftp.debian.org/debian experimental main

Should be changed to:

deb http://ftp.debian.org/debian sid main

Then follow the rest of perror's post:

Update your package database:

apt-get update

Install the glibc package:

apt-get -t sid install libc6-amd64 libc6-dev libc6-dbg

IMPORTANT

After updating libc6, restart the computer, and you should comment out or remove the sid source you just added (deb http://ftp.debian.org/debian sid main), or else you risk upgrading your whole distro to sid.

This is a similar situation to the problem in your previous question: you need to keep all libc-related packages at the same version.

To upgrade to libc 2.36, you need to install at least the libc-bin, libc6, and locales 2.36 packages. Note that in doing so you will have started the upgrade towards Debian 12 and you should plan on finishing it soon after it’s released. It’s possible that some of your other installed packages will be broken by the upgrade and will have to be updated to versions in Debian testing. I highly recommend reconsidering the upgrade, unless you want to end up helping the Debian project test its upcoming release.