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Hello,
Zyxel Prestige 681 SDSL router is vulnerable to *remote* denial of service.
By sending malformed packets, it is possible to bring down DSL link for few
minutes. The problem persists only if packets come from DSL interface, not
from Ethernet. ZyNOS reports that line is synchronizing and it takes about
2-3 minutes before link is up.
The workaround is to switch off routing and put device in bridging mode.
Zyxel support has been notified, I won't release details of attack, until
ZyNOS will be patched.
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