No exploitation reported

CVE-2015-6016

No exploitation reported by the sources we read.

Published2015-12-31
WeaknessCWE-255

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

ZyXEL P-660HW-T1 2 devices with ZyNOS firmware 3.40(AXH.0), PMG5318-B20A devices with firmware 1.00AANC0b5, and NBG-418N devices have a default password of 1234 for the admin account, which allows remote attackers to obtain administrative access via unspecified vectors.

Timeline

dates in UTC

2015-12-3105:59CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2015-6016?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2015-6016?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Zyxel nbg-418n

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Zyxel pmg5318-b20a firmware

Branch	Affected	Fixed in	Source
100.x	= v100aanc0b5	no fix published	NVD

Zyxel zynos firmwareversion to verify

Branch	Affected	Fixed in	Source
3.40	= 3.40\(axh.0\)	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.09.8read 2026-10-23
NVDCVSS 2.010read 2026-10-23
NVDweakness (CWE)CWE-255read 2026-10-23
FIRST EPSSEPSS score5.7 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2015-12-31
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2015-6016?

Is CVE-2015-6016 actively exploited?

Active exploitation of CVE-2015-6016 has not been confirmed. Its EPSS score was 5.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2015-6016?

CVE-2015-6016 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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