CVE-2020-27488Public exploitNetwork attack vector

Credential theft via unauthenticated Cloud DNS updates

Published Jan 13, 2021 · Updated Aug 4, 2024

Improper authentication in Loxone Miniserver Gen. 1 firmware before 11.1.9.3 allows remote attackers to redirect Cloud DNS users. The Cloud DNS service accepts a UDP update containing a claimed Miniserver MAC address and registers the sender's source IP and port without verifying the device. Targeted credential capture requires the device MAC address and a deceptive web interface; untargeted spoofing can interrupt remote access across Loxone's OUI range.

CVSS severity9.8
Critical
EPSS probability1.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Loxone Miniserver Gen. 1 firmware before 11.1.9.3 allows remote attackers to redirect Cloud DNS users. The Cloud DNS service accepts a UDP update containing a claimed Miniserver MAC address and registers the sender's source IP and port without verifying the device. Targeted credential capture requires the device MAC address and a deceptive web interface; untargeted spoofing can interrupt remote access across Loxone's OUI range.

The record

CVE
CVE-2020-27488
Published
Jan 13, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-287, T1056.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 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

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1056.003Input Capture: Web Portal Capture

Public exploit references

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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