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Improper AuthenticationWeakness · CWE-287

CVE-2026-12504

HIGH · 8.4 CVSS v4.0 Published 2026-07-24
No fix yet
No fix has been published. The vendor has not shipped a fixed release or patch. You remain exposed.
See remediation →
86/100
Remediation priority · High
Zero-click 4 weeks old

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-287

The mechanism that verifies who a user is can be side-stepped or fooled, letting an attacker act as someone they're not. Everything built on top of that identity then becomes untrustworthy. Fixing it means hardening the full authentication flow, including edge cases, tokens, and secondary paths.

General guidance for the improper authentication class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
High
Authentication
X
User interaction
None
Scope
X

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Recommended fix Moderate confidence

Firmware version 8.4.17 or later for the affected Loytec device models (LIP-ME201C, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS, L-PAD)

  1. 1. Identify the exact Loytec device model (LIP-ME201C, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS, or L-PAD) in your environment.
  2. 2. Check the current firmware version installed on the device through the Loytec web interface or administrative console.
  3. 3. Navigate to the Loytec download portal at www.loytec.com and locate the firmware downloads section.
  4. 4. Download the latest firmware version for your specific device model. Based on the affected version 'through 8.4.16', look for version 8.4.17 or later.
  5. 5. Review the firmware release notes to confirm the fix for CVE-2026-12504 is included.
  6. 6. Back up the current device configuration via the web interface or backup utility.
  7. 7. Apply the new firmware following the vendor's documented upgrade procedure (typically via web interface upload or USB deployment).
  8. 8. After upgrade, verify the firmware version and confirm the /etc/passwd file no longer contains any account with an empty password field.
Caveat Review release notes for any breaking changes or feature modifications between your current version and the upgrade version; firmware downgrades may not be supported

Generated from the published advisory — verify against the referenced sources before acting.

No vendor fix exists The vendor has not published a patch for this.

There is no version to upgrade to and no patch to apply. Every affected install stays exposed until the vendor ships a fix — or somebody else builds one.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-12504 in production — separate from our analysis above.

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