CVE-2026-12504
Received Received - Intake

Improper Authentication in Loytec LINX-A64 Devices

Publication date: 2026-07-24

Last updated on: 2026-07-24

Assigner: Switzerland Government Common Vulnerability Program

Description
Improper Authentication (CWE-287) in the PAM configuration in Loytec LIP-ME201C, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.16 on LINX-A64 allows a local attacker to authenticate as a uid=0 account without a password and obtain a root shell via an `/etc/passwd` entry with an empty password field.

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Meta Information

Published
2026-07-24
Last Modified
2026-07-24
Generated
2026-07-24
AI Q&A
2026-07-24
EPSS Evaluated
N/A
NVD
CVE-2026-12504
EUVD
EUVD-2026-48592

Affected Vendors & Products

Showing 9 associated CPEs
Vendor Product Version / Range
loytec lip-me201c *
loytec l-inx *
loytec l-gate *
loytec l-roc *
loytec l-iob *
loytec l-dali *
loytec l-vis *
loytec l-pad *
loytec l-web to 8.4.16 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-521 The product does not require that users should have strong passwords.
CWE-287 When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

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Executive Summary

This vulnerability is an improper authentication issue (CWE-287) in the PAM configuration of multiple LOYTEC devices. It allows a local attacker to gain root access without a password by exploiting an empty password field in /etc/passwd. The attacker can create a malicious user entry with uid=0 and then authenticate via su command.

Detection Guidance

Check for `/etc/passwd` entries with empty password fields by running `grep '^.*::' /etc/passwd`. Verify PAM configuration for `pam_unix.so nullok` in files like `/etc/pam.d/su` or `/etc/pam.d/common-auth` using `grep 'nullok' /etc/pam.d/*`. Inspect LOYTEC devices running firmware versions below 8.4.18.

Impact Analysis

If you use affected LOYTEC devices (LIP-ME201C, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS, L-PAD) running firmware before 8.4.16, an attacker with local access could gain full root privileges. This could lead to complete system compromise, unauthorized data access, or disruption of device functionality.

Compliance Impact

This vulnerability could violate compliance requirements that mandate strong authentication and access controls, such as GDPR's security principle or HIPAA's access control safeguards. Unauthorized root access could lead to data breaches or unauthorized system modifications, triggering regulatory penalties.

Mitigation Strategies

Upgrade affected LOYTEC devices to firmware version 8.4.18 or later. Remove `nullok` from PAM configurations in `/etc/pam.d/*` files. Ensure `/etc/passwd` has no entries with empty password fields. Restrict local access to these systems until patched.

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