CVE-2008-1524: Zyxel Prestige 660

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

The SNMP service on ZyXEL Prestige routers, including P-660 and P-661 models with firmware 3.40(AGD.2) through 3.40(AHQ.3), has "public" as its default community for both (1) read and (2) write operations, which allows remote attackers to perform administrative actions via SNMP, as demonstrated by reading the Dynamic DNS service password or inserting an XSS sequence into the system.sysName.0 variable, which is displayed on the System Status page.

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.