CVE-2023-1748Network attack vector

Cross-customer device control via embedded MQTT credentials

Published Apr 4, 2023 · Updated Jan 16, 2025

Hard-coded credentials in Nexx Smart Home device firmware allow remote attackers to access MQTT and control customer devices. The Nexx Home mobile application and affected firmware embed credentials for the shared MQTT server, exposing them to anyone who can inspect either client. No Nexx account is required; recovered credentials grant cross-customer MQTT access that can remotely operate garage doors and smart plugs.

CVSS severity9.3
Critical
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded credentials in Nexx Smart Home device firmware allow remote attackers to access MQTT and control customer devices. The Nexx Home mobile application and affected firmware embed credentials for the shared MQTT server, exposing them to anyone who can inspect either client. No Nexx account is required; recovered credentials grant cross-customer MQTT access that can remotely operate garage doors and smart plugs.

The record

CVE
CVE-2023-1748
Published
Apr 4, 2023
Updated
Jan 16, 2025
Vendor
Nexx
Product
Nexx Smart Alarm
Classifications
CWE-798, T1078, T1552.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=nxal100v-p1-9-1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nexx · Nexx Smart Alarmversion=0 <=nxal100v-p1-9-1
Nexx · Nexx Smart Plugversion=0 <=nxpg100cv4-0-0
Nexx · Nexx Smart Garageversion=0 <=nxg200v-p3-4-1

Published CVSS scores

9.3CISA ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L
10.0NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1078Valid Accounts
T1552.001Unsecured Credentials: Credentials In Files

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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