CVE-2026-12504

Root shell access via passwordless uid 0 account

Published Jul 24, 2026 · Updated Jul 24, 2026

Improper authentication in LOYTEC LINX-A64 firmware through 8.4.16 allows local users to obtain a root shell without a password. The PAM configuration accepts an /etc/passwd entry whose uid is 0 and whose password field is empty, authenticating that account without a secret. Local access and existing high privileges are required; successful exploitation grants full device control through a root shell.

CVSS severity8.4
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in LOYTEC LINX-A64 firmware through 8.4.16 allows local users to obtain a root shell without a password. The PAM configuration accepts an /etc/passwd entry whose uid is 0 and whose password field is empty, authenticating that account without a secret. Local access and existing high privileges are required; successful exploitation grants full device control through a root shell.

The record

CVE
CVE-2026-12504
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
LOYTEC
Product
L-GATE
Classifications
CWE-521, CWE-287, CAPEC-122, CAPEC-115, T1078.003
Attack vector
local
Privileges
admin

Timeline

How it unfolded

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

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <=8.4.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

LOYTEC · L-GATEversion=0 <=8.4.16
LOYTEC · L-IOBversion=0 <=8.4.16
LOYTEC · L-ROCversion=0 <=8.4.16
LOYTEC · L-INXversion=0 <=8.4.16
LOYTEC · LIP-ME20xCversion=0 <=8.4.16
LOYTEC · L-VISversion=0 <=8.4.16
LOYTEC · L-DALIversion=0 <=8.4.16
LOYTEC · L-PADversion=0 <=8.4.16

Published CVSS scores

8.4Switzerland Government Common Vulnerability ProgramCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-521Weak Password Requirements
CWE-287Improper Authentication
CAPEC-122Privilege Abuse
CAPEC-115Authentication Bypass
T1078.003Valid Accounts: Local 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

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Your stack

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