CVE-2023-4419Network attack vector

Unauthenticated device reconfiguration via hard-coded credentials

Published Aug 24, 2023 · Updated Jun 1, 2026

Use of hard-coded credentials in SICK AG LMS5xx firmware before 2.21 allows remote attackers to reconfigure or disrupt the device. The firmware contains hard-coded credentials usable through the Ethernet-accessible device interface; SICK has not disclosed their values or exact authentication locus. Network reachability is sufficient and no prior account or user interaction is required, enabling unauthorized settings changes and interruption of sensor functionality.

CVSS severity9.8
Critical
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Use of hard-coded credentials in SICK AG LMS5xx firmware before 2.21 allows remote attackers to reconfigure or disrupt the device. The firmware contains hard-coded credentials usable through the Ethernet-accessible device interface; SICK has not disclosed their values or exact authentication locus. Network reachability is sufficient and no prior account or user interaction is required, enabling unauthorized settings changes and interruption of sensor functionality.

The record

CVE
CVE-2023-4419
Published
Aug 24, 2023
Updated
Jun 1, 2026
Vendor
SICK AG
Product
LMS5xx
Classifications
CWE-798, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <2.21
  2. Affected versionversion=0 <V2.21

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SICK AG · LMS5xxversion=0 <2.21; version=0 <V2.21

Published CVSS scores

9.8SICK AGCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1078Valid Accounts

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo