How severe is CVE-2015-6020?

CVE-2015-6020 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2015-6020 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-6020?

CVE-2015-6020 affects Zyxel Pmg5318-b20a Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-6020?

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-2015-6020 published?

CVE-2015-6020 was published on 2015-12-31 and last updated on 2026-06-17.

CVE-2015-6020

CVE-2015-6020 is a high-severity vulnerability in Zyxel Pmg5318-b20a Firmware with a CVSS 3.x base score of 8.0. 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-264.

Key facts

Severity: High (CVSS 3.x base score 8.0)
CVSS v2: 8.3
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Zyxel Pmg5318-b20a Firmware
Published: 2015-12-31
Last modified: 2026-06-17

Description

ZyXEL PMG5318-B20A devices with firmware 1.00AANC0b5 allow remote authenticated users to obtain administrative privileges by leveraging access to the user account.

Frequently asked questions

What is CVE-2015-6020?: ZyXEL PMG5318-B20A devices with firmware 1.00AANC0b5 allow remote authenticated users to obtain administrative privileges by leveraging access to the user account.
How severe is CVE-2015-6020?: CVE-2015-6020 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2015-6020 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-6020?: CVE-2015-6020 affects Zyxel Pmg5318-b20a Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-6020?: 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-2015-6020 published?: CVE-2015-6020 was published on 2015-12-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:zyxel:pmg5318-b20a_firmware:v100aanc0b5:*:*:*:*:*:*:*

More vulnerabilities in Zyxel Pmg5318-b20a Firmware

CVE-2015-6018 — Critical (CVSS 9.8): The diagnostic-ping implementation on ZyXEL PMG5318-B20A devices with firmware before 1.00(AANC.2)C0 allows remote…
CVE-2015-6016 — Critical (CVSS 9.8): ZyXEL P-660HW-T1 2 devices with ZyNOS firmware 3.40(AXH.0), PMG5318-B20A devices with firmware 1.00AANC0b5, and…
CVE-2015-6019 — High (CVSS 8.5): The management portal on ZyXEL PMG5318-B20A devices with firmware 1.00AANC0b5 does not terminate sessions upon a logout…
CVE-2015-7256 — Medium (CVSS 5.9): ZyXEL NWA1100-N, NWA1100-NH, NWA1121-NI, NWA1123-AC, and NWA1123-NI access points; P-660HN-51, P-663HN-51,…

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