by Kastro
Paper/Archive/CVE-2026-12503

CVE-2026-12503

Loytec LIP-ME20xC — Loytec LINX firmware: Improper Link Resolution in /usr/bin/larm_starter

EPSS 0.2%CVSS 9.2
critical.is priorityof 100
29
CVSS 9.2 (CNA)9.2 / 10 × 3027.6Not in CISA KEV+300.0EPSS percentile 7.7.077 × 201.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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`.

Affected

ProductAffectedFixed inSource
LIP-ME20xC≤ 8.4.16–CNA
L-INX≤ 8.4.16–CNA
L-GATE≤ 8.4.16–CNA
L-ROC≤ 8.4.16–CNA
L-IOB≤ 8.4.16–CNA
L-DALI≤ 8.4.16–CNA
L-VIS≤ 8.4.16–CNA
L-PAD≤ 8.4.16–CNA

Scores by source

NCSC.ch (CNA)9.2CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:H/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

advisoryloytec.com/support/product-security/advisories/8520-dibt-cve-20260526-0002-symlink-following-in-chown-chmod-critical