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#Zyxel announced CVE-2020-29583 fixing a backdoor admin account which gave attackers root on affected devices via SSH or web interface

If you want to examine the firmware you need to run a #known_plaintext_attack against an encrypted zip

Sounds hard; don't worry I got you... 👇
Zyxel have actually removed the backdoored firmware versions from their portal; but you can still grab the latest version or earlier versions for further inspection.

Example:

portal.myzyxel.com/my/firmwares?f

Now, unzip the contents and you should have something like this
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