How severe is CVE-2008-1523?

CVE-2008-1523 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2008-1523 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-1523?

CVE-2008-1523 primarily affects Zyxel Prestige 660. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-1523?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2008-1523 published?

CVE-2008-1523 was published on 2008-03-26 and last updated on 2026-06-16.

CVE-2008-1523

CVE-2008-1523 is a medium-severity vulnerability in Zyxel Prestige 660 with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Zyxel Prestige 660
Published: 2008-03-26
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2008-1523?: 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.
How severe is CVE-2008-1523?: CVE-2008-1523 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2008-1523 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-1523?: CVE-2008-1523 primarily affects Zyxel Prestige 660. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-1523?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2008-1523 published?: CVE-2008-1523 was published on 2008-03-26 and last updated on 2026-06-16.

References

Affected products (9)

cpe:2.3:h:zyxel:prestige_660:h-d1:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:prestige_660:h-d3:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:prestige_661:hw-d1:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:zynos:3.40:agd.2:*:*:*:*:*:*
cpe:2.3:h:zyxel:zynos:3.40:agl.3:*:*:*:*:*:*
cpe:2.3:h:zyxel:zynos:3.40:ahq.0:*:*:*:*:*:*
cpe:2.3:h:zyxel:zynos:3.40:ahq.3:*:*:*:*:*:*
cpe:2.3:h:zyxel:zynos:3.40:ahz.0:*:*:*:*:*:*
cpe:2.3:h:zyxel:zynos:3.40:atm.0:*:*:*:*:*:*

More vulnerabilities in Zyxel Prestige 660

CVE-2008-1522 — High (CVSS 7.5): ZyXEL Prestige routers, including P-660 and P-661 models with firmware 3.40(AGD.2) through 3.40(AHQ.3), have (1) "user"…
CVE-2008-1527 — High (CVSS 7.5): ZyXEL Prestige routers, including P-660, P-661, and P-662 models with firmware 3.40(PE9) and 3.40(AGD.2) through…
CVE-2008-1524 — High (CVSS 7.5): The SNMP service on ZyXEL Prestige routers, including P-660 and P-661 models with firmware 3.40(AGD.2) through…
CVE-2008-1521 — Medium (CVSS 6.5): ZyXEL Prestige routers, including P-660 and P-661 models with firmware 3.40(AGD.2) through 3.40(AHQ.3), allow remote…
CVE-2008-1529 — Medium (CVSS 5.0): ZyXEL Prestige routers have a minimum password length for the admin account that is too small, which makes it easier…
CVE-2008-1525 — Medium (CVSS 5.0): The default SNMP configuration on ZyXEL Prestige routers, including P-660 and P-661 models with firmware 3.40(AGD.2)…

All CVEs affecting Zyxel Prestige 660 →

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