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Date: Sun, 14 Aug 2022 22:19:36 -0500
From: Eric Urban <>
Subject: [FD] Zyxel IPC 3605N & 4605N / Remote shell access

Hello everyone,

I have identified that the Zyxel IPC 3605N and 4605N IP based security
cameras have multiple flaws. Combining these together leads to the ability
for an attacker to remotely install root shell access on the device.

A web server installed for UPnP purposes allows the plaintext passwords to
be retrieved by anyone. This grants access to the web administration
interface. From there, a tarball can be downloaded, modified with a script
to execute telnetd, and then uploaded back to the device.

Full report with link to a PoC here:

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