Zyxel NAS NAS540 · Version Status
Zyxel NAS NAS540 End of Life Date
Zyxel NAS NAS540 end-of-life date, support status, and CVE risk. Dates read at the vendor's own lifecycle pages (zyxel.com); the source of each date is on the product page.
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Zyxel NAS NAS540 is past end of life. This version no longer receives security patches. 1244 days past EOL — migrate to a supported version immediately.
EOL Date
May 30, 2023
1244 days past EOL
Latest Release
5.21(AATB.11)C0
Standard release
Release Date
—
Zyxel NAS NAS540 series
Where these dates come from
End of lifeMay 30, 2023Our catalog, built from the vendor pages · zyxel.commedium · 1 source agrees End of active supportMay 30, 2023Our catalog, built from the vendor pages · zyxel.commedium · 1 source agrees End of Life (support only, no fixes)Nov 30, 2023Our catalog, built from the vendor pages · zyxel.commedium · 1 source agrees Confidence: high = two or more independent sources agree (the vendor's page read by our adapter, a person's check against the vendor, the dataset the date came from); medium = one; low = the vendor page disagrees or our last read is stale.
How we source dates.
Lifecycle detail
It has been past its end-of-life date for 3 years and 5 months.
Attack Surface
10/30 Medium tier
CISA KEV Exposure
20/20 Named in CISA KEV
Extended Support
10/10 None available
EOL Risk Score™ — proprietary methodology by endoflife.ai. Factors: EOL recency, attack surface breadth, CISA KEV catalog presence, extended support availability. Updated at every build.
Methodology → ·
View score card →
| Version | Latest | EOL Date | Status |
|---|
| → NAS540 |
5.21(AATB.11)C0 |
May 30, 2023 |
EOL |
| NAS542 |
V5.21(ABAG.15)C0 |
Dec 31, 2023 |
EOL |
| NAS326 |
V5.21(AAZF.18)C0 |
Dec 31, 2023 |
EOL |
What does Zyxel NAS NAS540 end of life mean?
When Zyxel NAS NAS540 reaches end of life, the maintainers stop issuing security patches for this version. CVEs discovered after the EOL date are publicly disclosed on the National Vulnerability Database with no patch available. Exploit code frequently appears on GitHub within days of disclosure.
The CVE blind spot: A CVE-based scan does not show the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Some scanners flag unsupported versions of common products, but coverage varies, and none of them give you the date in advance. Running Zyxel NAS NAS540 past its EOL date creates a growing attack surface that a clean scan result does not rule out.
Migrate to a supported version or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Zyxel NAS NAS540 reach end of life?
Zyxel NAS NAS540 reached end of life on May 30, 2023. This version is no longer receiving security patches.
Is Zyxel NAS NAS540 still supported?
No. Zyxel NAS NAS540 reached end of life on May 30, 2023 and is no longer receiving security patches.
What should I upgrade to from Zyxel NAS NAS540?
What are the security risks of running Zyxel NAS NAS540 past EOL?
Since Zyxel NAS NAS540 reached end of life, the maintainers no longer issue security patches. Any CVEs disclosed after the EOL date accumulate with no vendor fix. A CVE-based scan does not show this — it is the CVE blind spot; some scanners flag unsupported versions of common products, but coverage varies and none give the date in advance. Organizations running EOL Zyxel NAS should migrate immediately or implement compensating controls.