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Date: Fri, 19 Jan 2007 16:46:55 +0100
Subject: DoS against AVM Fritz!Box 7050 (and others)

Denial of Service against AVM Fritz!Box 7050 (and others)

Discovered by: Matthias Wenzel

Manufacturer: AVM (
Product: Fritz!Box 750 (and others)

Vendor was notified 6 month ago (see blog entry by Matthias)

Sending a zero-length UDP packet to port 5060 (SIP) of a AVM Fritz!Box will
crash the VoIP-telephony application. This works from any IP-interface,
including the DSL line.

Collin (only delivering the message to FD and BugTraq)

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