Loytec LINX firmware: Improper Link Resolution in /usr/bin/larm_starter
Priority MEDIUM 41CWE-59Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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`.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00181 7th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Loytec | LIP-ME20xC | up to 8.4.16 | — | No fix listed | CNA |
| Loytec | L-INX | up to 8.4.16 | — | No fix listed | CNA |
| Loytec | L-GATE | up to 8.4.16 | — | No fix listed | CNA |
| Loytec | L-ROC | up to 8.4.16 | — | No fix listed | CNA |
| Loytec | L-IOB | up to 8.4.16 | — | No fix listed | CNA |
| Loytec | L-DALI | up to 8.4.16 | — | No fix listed | CNA |
| Loytec | L-VIS | up to 8.4.16 | — | No fix listed | CNA |
| Loytec | L-PAD | up to 8.4.16 | — | No fix listed | CNA |
- LIP-ME20xC VendorLoytec Affected up to 8.4.16 Fixed in — No fix listed CNA
- L-INX VendorLoytec Affected up to 8.4.16 Fixed in — No fix listed CNA
- L-GATE VendorLoytec Affected up to 8.4.16 Fixed in — No fix listed CNA
- L-ROC VendorLoytec Affected up to 8.4.16 Fixed in — No fix listed CNA
- L-IOB VendorLoytec Affected up to 8.4.16 Fixed in — No fix listed CNA
- L-DALI VendorLoytec Affected up to 8.4.16 Fixed in — No fix listed CNA
- L-VIS VendorLoytec Affected up to 8.4.16 Fixed in — No fix listed CNA
- L-PAD VendorLoytec Affected up to 8.4.16 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-12503
- 2026-10-03 Alias added: GHSA-4p7f-6rpf-28mq
References
More Loytec vulnerabilities
- TI-2018-10727 LOYTEC LGATE-902 6.3.2 devices allow Arbitrary file deletion. CVSS 3.0CRITICAL 9.1
- TI-2023-24969 LOYTEC LINX-151, LINX-212, LVIS-3ME12-A1, LIOB-586, LIOB-580 V2, LIOB-588, L-INX… CVSS 3.1HIGH 8.2
- TI-2018-10728 LOYTEC LGATE-902 6.3.2 devices allow Directory Traversal. CVSS 3.0HIGH 7.5
- TI-2026-40228 Loytec LWEB802: Reflected Cross-Site Scripting in LWEB802 CVSS 4.0HIGH 8.7
- TI-2015-06575 LOYTEC LIP-3ECTB 6.0.1, LINX-100, LVIS-3E100, and LIP-ME201 devices allow remote… CVSS 2.0HIGH 10.0
- TI-2026-40230 Loytec LINX firmware: Out-of-bounds Read in BACnet packet parsing (bacdt_datetime_to_tod) CVSS 4.0HIGH 8.7
Sources
- CVE-2026-12503 · CVE Program
- CVE-2026-12503 · NVD
- FIRST EPSS
- GHSA-4p7f-6rpf-28mq · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences