How severe is CVE-2008-1256?

CVE-2008-1256 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2008-1256 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-1256?

CVE-2008-1256 affects Zyxel P-660hw. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2008-1256?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2008-1256 published?

CVE-2008-1256 was published on 2008-03-10 and last updated on 2026-06-16.

CVE-2008-1256

CVE-2008-1256 is a critical-severity vulnerability in Zyxel P-660hw with a CVSS 2.0 base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Zyxel P-660hw
Published: 2008-03-10
Last modified: 2026-06-16

Description

The ZyXEL P-660HW series router has "admin" as its default password, which allows remote attackers to gain administrative access.

Frequently asked questions

What is CVE-2008-1256?: The ZyXEL P-660HW series router has "admin" as its default password, which allows remote attackers to gain administrative access.
How severe is CVE-2008-1256?: CVE-2008-1256 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2008-1256 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-1256?: CVE-2008-1256 affects Zyxel P-660hw. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2008-1256?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2008-1256 published?: CVE-2008-1256 was published on 2008-03-10 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:h:zyxel:p-660hw:*:*:*:*:*:*:*:*

More vulnerabilities in Zyxel P-660hw

CVE-2008-1255 — Critical (CVSS 10.0): The ZyXEL P-660HW series router maintains authentication state by IP address, which allows remote attackers to bypass…
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CVE-2008-1254 — Medium (CVSS 6.8): Multiple cross-site request forgery (CSRF) vulnerabilities on the ZyXEL P-660HW series router allow remote attackers to…
CVE-2008-1257 — Medium (CVSS 4.3): Cross-site scripting (XSS) vulnerability in Forms/DiagGeneral_2 on the ZyXEL P-660HW series router allows remote…

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