CVE-2008-1522: Zyxel Prestige 660

High severity, CVSS 7.5. EPSS: 1.4% chance of exploitation in the next 30 days.

ZyXEL Prestige routers, including P-660 and P-661 models with firmware 3.40(AGD.2) through 3.40(AHQ.3), have (1) "user" as their default password for the "user" account and (2) "1234" as their default password for the "admin" account, which makes it easier for remote attackers to obtain access.

Affected products

• Zyxel Prestige 660: version h-d1 only; version h-d3 only
• Zyxel Prestige 661: version hw-d1 only
• Zyxel Zynos: version 3.40 only

Published 2008-03-26. Last modified 2026-06-16.