CVE-2021-40825: nLight ECLYPSE (nECY) system Controllers running software prior to 1.17.21245.754 contain a default key vulner

Q: How do I fix CVE-2021-40825?

nlight eclypse system controller firmware: upgrade to 1.17.21245.754. Exact commands for each OS are on this page.

Q: Is CVE-2021-40825 being exploited?

CVE-2021-40825 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-40825 affect?

CVE-2021-40825 affects nlight eclypse system controller firmware. Severity is high (CVSS 8.6). nLight ECLYPSE (nECY) system Controllers running software prior to 1.17.21245.754 contain a default key vulnerability. The nECY does not force a change to the key upon the initial configuration of an affected device. nECY system controllers

Q: How urgent is CVE-2021-40825?

Priority 52/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 8.6REMOTEUPGRADE

CVE-2021-40825 is a high-severity flaw (CVSS 8.6) affecting nlight eclypse system controller firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

nLight ECLYPSE (nECY) system Controllers running software prior to 1.17.21245.754 contain a default key vulnerability. The nECY does not force a change to the key upon the initial configuration of an affected device. nECY system controllers utilize an encrypted channel to secure SensorViewTM configuration and monitoring software and nECY to nECY communications. Impacted devices are at risk of exploitation. A remote attacker with IP access to an i

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-1188
Published	2021-09-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: acuitybrands

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-09-17 17:15 UTCPublished CVE record published
2026-06-17 04:07 UTCUpdated Record last modified

acuitybrands nlight eclypse system controller firmware UPGRADE

Affected: < 1.17.21245.754

Fixed in: 1.17.21245.754

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-40825?

nlight eclypse system controller firmware: upgrade to 1.17.21245.754. Exact commands for each OS are on this page.

Is CVE-2021-40825 being exploited?

CVE-2021-40825 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-40825 affect?

CVE-2021-40825 affects nlight eclypse system controller firmware. Severity is high (CVSS 8.6). nLight ECLYPSE (nECY) system Controllers running software prior to 1.17.21245.754 contain a default key vulnerability. The nECY does not force a change to the key upon the initial configuration of an affected device. nECY system controllers

How urgent is CVE-2021-40825?

Priority 52/100. High severity; Remotely exploitable, no login, no user action

References

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