CVE-2021-22806Network attack vector

Data exfiltration via permissive cross-origin resource sharing

Published Feb 11, 2022 · Updated Aug 3, 2024

Cross-origin resource sharing in spaceLYnk, Wiser for KNX, and fellerLYnk 2.6.1 and earlier allows remote attackers to exfiltrate data. The products permit cross-origin requests from a malicious website to cross the controller trust boundary and access protected resources. A victim must access an attacker-controlled website while a controller is reachable; the documented consequences are data disclosure and unauthorized access.

CVSS severity8.2
High
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-origin resource sharing in spaceLYnk, Wiser for KNX, and fellerLYnk 2.6.1 and earlier allows remote attackers to exfiltrate data. The products permit cross-origin requests from a malicious website to cross the controller trust boundary and access protected resources. A victim must access an attacker-controlled website while a controller is reachable; the documented consequences are data disclosure and unauthorized access.

The record

CVE
CVE-2021-22806
Published
Feb 11, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-669, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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:P/I:N/A:N
8.2Schneider ElectricCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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-669Incorrect Resource Transfer Between Spheres
T1189Drive-by Compromise

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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