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Vulnerability record · CVE-2008-1523 · published 26 March 2008

CVE-2008-1523: Zyxel prestige 660 information exposure vulnerability

Zyxel · Prestige 660

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.

5.0 CVSS 2.0 Medium EPSS 1.2% · top 32.6% CWE-200 · Information exposure
5.0CVSS 2.0 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
8References
16 Jun 2026Last modified by NVD

Description

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.

AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.gnucitizen.org/projects/router-hacking-challenge/
http://www.procheckup.com/Hacking_ZyXEL_Gateways.pdf
http://www.securityfocus.com/archive/1/489009/100/0/threaded
https://exchange.xforce.ibmcloud.com/vulnerabilities/41509
http://www.gnucitizen.org/projects/router-hacking-challenge/
http://www.procheckup.com/Hacking_ZyXEL_Gateways.pdf
http://www.securityfocus.com/archive/1/489009/100/0/threaded
https://exchange.xforce.ibmcloud.com/vulnerabilities/41509

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.8CVE-2007-1586Zyxel zynos vulnerabilityZynOS 3.40 allows remote attackers to cause a denial of service (link restart) by sending a request for the name \M via the SMB Mail Slot Protocol.EPSS 3.1%7.5CVE-2008-1522Zyxel prestige 660 vulnerabilityZyXEL 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…EPSS 1.4%7.5CVE-2008-1524Zyxel prestige 660 vulnerabilityThe 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 defau…EPSS 1.3%7.5CVE-2008-1527Zyxel prestige 660 vulnerabilityZyXEL Prestige routers, including P-660, P-661, and P-662 models with firmware 3.40(PE9) and 3.40(AGD.2) through 3.40(AHQ.3), support authentication …EPSS 1.4%6.5CVE-2008-1521Zyxel prestige 660 permissions and access controls vulnerabilityZyXEL Prestige routers, including P-660 and P-661 models with firmware 3.40(AGD.2) through 3.40(AHQ.3), allow remote authenticated users to gain priv…EPSS 1.1%5.0CVE-2008-1525Zyxel prestige 660 vulnerabilityThe default SNMP configuration on ZyXEL Prestige routers, including P-660 and P-661 models with firmware 3.40(AGD.2) through 3.40(AHQ.3), has a Trust…EPSS 1.2%5.0CVE-2008-1529Zyxel prestige 660 vulnerabilityZyXEL Prestige routers have a minimum password length for the admin account that is too small, which makes it easier for remote attackers to guess pa…EPSS 1.2%5.0CVE-2004-1540Zyxel prestige vulnerabilityZyXEL Prestige 623, 650, and 652 HW Routers, and possibly other versions, with HTTP Remote Administration enabled, does not require a password to acc…EPSS 6.6%

Source: NIST National Vulnerability Database (record CVE-2008-1523), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.