CVE-2021-40825Network attack vector

Unauthenticated lighting control via unchanged default key

Published Sep 17, 2021 · Updated Aug 4, 2024

Default-key exposure in Acuity Brands nLight ECLYPSE firmware before 1.17.21245.754 allows remote attackers to alter lighting. The controller leaves the SensorView or Gateway communication key unchanged after initial configuration, so the shared default unlocks encrypted control messages. IP reachability and an unchanged key are required; accepted commands can change lighting conditions or update lighting-device software but cannot reconfigure the controller.

CVSS severity8.6
High
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Default-key exposure in Acuity Brands nLight ECLYPSE firmware before 1.17.21245.754 allows remote attackers to alter lighting. The controller leaves the SensorView or Gateway communication key unchanged after initial configuration, so the shared default unlocks encrypted control messages. IP reachability and an unchanged key are required; accepted commands can change lighting conditions or update lighting-device software but cannot reconfigure the controller.

The record

CVE
CVE-2021-40825
Published
Sep 17, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1188
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/A:N
8.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1188Insecure Default Initialization of Resource

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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