Detections
Analytics

LOYTEC L-IP BACnet/IP Routers Improper Authentication (CVE-2026-12504)

high Tenable OT Security Plugin ID 505942

Synopsis

The remote OT asset is affected by a vulnerability.

Description

The PAM configuration of a LOYTEC L-IP BACnet/IP router uses the 'pam_unix.so nullok' option, which permits authentication against any local account that has an empty password field in '/etc/passwd'. A local attacker can leverage an account left without a password to authenticate as uid=0 and obtain a root shell without providing any credentials.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

Upgrade to firmware version 8.4.18 or later.

See Also

http://www.nessus.org/u?43a47063

Plugin Details

Severity: High

ID: 505942

File Name: tenable_ot_loytecelectronics_CVE-2026-12504.nasl

Version: 1.3

Type: Remote

Family: Tenable.ot

Published: 9/7/2026

Updated: 10/8/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.15

CVSS v3

Risk Factor: Medium

Base Score: 6.7

Temporal Score: 5.8

Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.4

Threat Score: 5.7

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:loytec:lip-me201c_firmware, cpe:/o:loytec:lip-me202c_firmware, cpe:/o:loytec:lip-me204c_firmware

Required KB Items: Tenable.ot/LOYTECElectronics

Exploit Ease: No known exploits are available

Patch Publication Date: 6/22/2026

Vulnerability Publication Date: 6/22/2026

Reference Information

CVE: CVE-2026-12504

CWE: 287, 521