How severe is CVE-2016-10401?

CVE-2016-10401 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-10401 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-10401?

CVE-2016-10401 affects Zyxel Pk5001z Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-10401?

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-2016-10401 published?

CVE-2016-10401 was published on 2017-07-25 and last updated on 2026-06-17.

CVE-2016-10401

CVE-2016-10401 is a high-severity vulnerability in Zyxel Pk5001z Firmware with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 12% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-255.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
EPSS exploit prediction: 12% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-255
Affected product: Zyxel Pk5001z Firmware
Published: 2017-07-25
Last modified: 2026-06-17

Description

ZyXEL PK5001Z devices have zyad5001 as the su password, which makes it easier for remote attackers to obtain root access if a non-root account password is known (or a non-root default account exists within an ISP's deployment of these devices).

Frequently asked questions

What is CVE-2016-10401?: ZyXEL PK5001Z devices have zyad5001 as the su password, which makes it easier for remote attackers to obtain root access if a non-root account password is known (or a non-root default account exists within an ISP's deployment of these devices).
How severe is CVE-2016-10401?: CVE-2016-10401 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-10401 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-10401?: CVE-2016-10401 affects Zyxel Pk5001z Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-10401?: 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-2016-10401 published?: CVE-2016-10401 was published on 2017-07-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:zyxel:pk5001z_firmware:-:*:*:*:*:*:*:*

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