How severe is CVE-2015-5989?

CVE-2015-5989 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2015-5989 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-5989?

CVE-2015-5989 affects Zyxel Gs1900-10hp Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-5989?

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-2015-5989 published?

CVE-2015-5989 was published on 2015-12-31 and last updated on 2026-06-17.

CVE-2015-5989

CVE-2015-5989 is a critical-severity vulnerability in Zyxel Gs1900-10hp Firmware with a CVSS 3.x base score of 9.8. 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-264.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Zyxel Gs1900-10hp Firmware
Published: 2015-12-31
Last modified: 2026-06-17

Description

Belkin F9K1102 2 devices with firmware 2.10.17 rely on client-side JavaScript code for authorization, which allows remote attackers to obtain administrative privileges via certain changes to LockStatus and Login_Success values.

Frequently asked questions

What is CVE-2015-5989?: Belkin F9K1102 2 devices with firmware 2.10.17 rely on client-side JavaScript code for authorization, which allows remote attackers to obtain administrative privileges via certain changes to LockStatus and Login_Success values.
How severe is CVE-2015-5989?: CVE-2015-5989 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2015-5989 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-5989?: CVE-2015-5989 affects Zyxel Gs1900-10hp Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-5989?: 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-2015-5989 published?: CVE-2015-5989 was published on 2015-12-31 and last updated on 2026-06-17.

References

https://www.kb.cert.org/vuls/id/201168

Affected products (1)

cpe:2.3:o:zyxel:gs1900-10hp_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Zyxel Gs1900-10hp Firmware

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CVE-2015-5988 — Critical (CVSS 9.8): The web management interface on Belkin F9K1102 2 devices with firmware 2.10.17 has a blank password, which allows…
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CVE-2019-15799 — High (CVSS 8.8): An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. User accounts created through the…
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