CVE-2023-4420 - CVE House
Back to Database
Status published Critical CVE-2023-4420

A remote unprivileged attacker can intercept the communication via e.g....

Vulnerability Description

A remote unprivileged attacker can intercept the communication via e.g. Man-In-The-Middle, due to the absence of Transport Layer Security (TLS) in the SICK LMS5xx. This lack of encryption in the communication channel can lead to the unauthorized disclosure of sensitive information. The attacker can exploit this weakness to eavesdrop on the communication between the LMS5xx and the Client, and potentially manipulate the data being transmitted.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2023-4420

Credits & Attribution

No credits recorded in the NVD database.

References

More from SICK AG

View All →
CVE-2025-9914
The credentials of the users stored in the system's local...
Medium 4.3
CVE-2025-9913
Cross Site Scripting: Session Hijacking
Medium 4.5
CVE-2025-59463
Denial-of-service (DoS) via chunk size mismatch
Medium 4.3
CVE-2025-59462
Denial-of-service (DoS) via delayed or missing client response
Medium 6.5
CVE-2025-59461
API does not require authentication
High 7.6

Affected Vendor

Affected Software

LMS5xx
Vulnerable Versions:
all firmware versions

Timeline

Official Publish: August 24th, 2023
Last Modified: June 1st, 2026
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.