CVE-2008-1526

CVE-2008-1526 is a high-severity vulnerability in Zyxel P-663hn-51 Firmware with a CVSS 3.x base score of 7.5. 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-916.

Key facts

• Severity: High (CVSS 3.x base score 7.5)
• CVSS v2: 5.0
• EPSS exploit prediction: 1% (55th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-916
• Affected product: Zyxel P-663hn-51 Firmware
• 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(PE9) and 3.40(AGD.2) through 3.40(AHQ.3), do not use a salt when calculating an MD5 password hash, which makes it easier for attackers to crack passwords.

Frequently asked questions

What is CVE-2008-1526?

ZyXEL 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), do not use a salt when calculating an MD5 password hash, which makes it easier for attackers to crack passwords.

How severe is CVE-2008-1526?

CVE-2008-1526 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2008-1526 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-1526?

CVE-2008-1526 primarily affects Zyxel P-663hn-51 Firmware. In total, 38 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-1526?

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

When was CVE-2008-1526 published?

CVE-2008-1526 was published on 2008-03-26 and last updated on 2026-06-16.

References

• 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

Affected products (38)

• cpe:2.3:o:zyxel:p-663hn-51_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-663hn-51_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660h-61_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660h-61_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660h-63_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660h-63_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660h-67_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660h-67_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660h-d1_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660h-d1_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660h-d3_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660h-d3_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660hn-51_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660hn-51_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660h-t1_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660h-t1_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660hw_d1_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660hw_d1_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660hw_d3_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660hw_d3_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660hw_t3_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-660hw_t3_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-661hnu-f1_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-661hnu-f1_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-661h_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-661h_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-661hw-d1_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-661hw-d1_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-661hnu-f3_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-661hnu-f3_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-662hw-d3_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-662hw-d3_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-662hw-d_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-662hw-d_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-662hw-d1_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-662hw-d1_firmware:3.40\(pe9\):*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-662h-61_firmware:*:*:*:*:*:*:*:*
• cpe:2.3:o:zyxel:p-662h-61_firmware:3.40\(pe9\):*:*:*:*:*:*:*

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