CVE-2026-12503

Loytec LINX firmware: Improper Link Resolution in /usr/bin/larm_starter

Published Jul 24, 2026 CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
Description
Improper Link Resolution (CWE-59) in `/usr/bin/larm_starter` in Loytec L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.16 on LINX-A64 allows an authenticated `larmapp` attacker to make `/etc/passwd` writable by the `larmapp` group (leading to root privilege escalation) via a symlink attack on `/etc/lighttpd/ssl/server.pem`.

Remediation

Vendor Solution

Upgrade to firmware 8.4.18.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Loytec
Loytec l-dali
Loytec l-gate
Loytec l-inx
Loytec l-iob
Loytec l-pad
Loytec l-roc
Loytec l-vis
Loytec lip-me20xc
Vendors & Products Loytec
Loytec l-dali
Loytec l-gate
Loytec l-inx
Loytec l-iob
Loytec l-pad
Loytec l-roc
Loytec l-vis
Loytec lip-me20xc
Type Values Removed Values Added
Description Improper Link Resolution (CWE-59) in `/usr/bin/larm_starter` in Loytec L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.16 on LINX-A64 allows an authenticated `larmapp` attacker to make `/etc/passwd` writable by the `larmapp` group (leading to root privilege escalation) via a symlink attack on `/etc/lighttpd/ssl/server.pem`.
Title Loytec LINX firmware: Improper Link Resolution in /usr/bin/larm_starter
Weaknesses CWE-59
References
Metrics cvssV4_0

{'score': 9.2, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:H/SA:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
NCSC.ch
Published
Updated
Jul 24, 2026, 2:57 PM
Reserved
Jun 17, 2026, 9:48 AM
Status
Deferred
Published
Jul 24, 2026, 3:17 PM
Modified
Jul 27, 2026, 8:32 PM