CVE-2008-1523: Zyxel Prestige 660

Medium severity, CVSS 5.0. EPSS: 1.2% chance of exploitation in the next 30 days.

ZyXEL Prestige routers, including P-660, P-661, and P-662 models with firmware 3.40(AGD.2) through 3.40(AHQ.3), allow remote authenticated users to obtain ISP and Dynamic DNS credentials by sending a direct request for (1) WAN.html, (2) wzPPPOE.html, and (3) rpDyDNS.html, and then reading the HTML source.

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.