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Date: Thu, 28 Sep 2017 16:59:20 +0200
From: Willem de Groot <>
Subject: [FD] Zyxel P-2812HNU-F1 DSL router - command injection

Zyxel P-2812HNU-F1 DSL router - command injection
The Zyxel P-2812 is common in the Netherlands (KPN/Telfort) and Norway
(Telenor). The Dutch firmware is susceptible to authenticated command
through `qos_queue_add.cgi` and the `WebQueueInterface` parameter.

Affected firmware versions
V3.11TUE3 (KPN)
V3.11TUE8 (KPN)

Not affected
BLN.18 and up (Telenor)

Disclosure timeline
2017-02-05 Notified
2017-02-11 Notified
2017-02-15 KPN: "escalated to Zyxel"
2017-02-23 Telenor: "we have fixed this previously in BLN18"
2017-09-28 Public disclosure

Proof of concept code
Sample code at

Security fixes for branded Zyxel firmware are not necessarily implemented
by all OEM clients.

Willem de Groot

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