Missing authentication in Siemens SICLOCK TC100, SICLOCK TC400
Priority MEDIUM 43CWE-306Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-306.
Summary
A vulnerability has been identified in SICLOCK TC100 (All versions) and SICLOCK TC400 (All versions). An attacker with network access to port 69/udp could modify the administrative client stored on the device. If a legitimate user downloads and executes the modified client from the affected device, then he/she could obtain code execution on the client system.
Why it matters now
EPSS 0.02544 85th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Siemens | SICLOCK TC100, SICLOCK TC400 | SICLOCK TC100 : All versions; SICLOCK TC400 : All versions | — | No fix listed | CNA |
- SICLOCK TC100, SICLOCK TC400 VendorSiemens Affected SICLOCK TC100 : All versions; SICLOCK TC400 : All versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:siemens:siclock_tc400_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Siemens |
| cpe:2.3:h:siemens:siclock_tc400:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:siclock_tc100_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Siemens |
| cpe:2.3:h:siemens:siclock_tc100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
- cpe:2.3:o:siemens:siclock_tc400_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Siemens
- cpe:2.3:h:siemens:siclock_tc400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:siclock_tc100_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Siemens
- cpe:2.3:h:siemens:siclock_tc100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2018-4854
- 2026-10-03 Alias added: GHSA-w4g7-qqm9-9hj6
References
More Siemens Siclock Tc100 Firmware vulnerabilities
- TI-2018-03429 Authentication bypass in Siemens SICLOCK TC100, SICLOCK TC400 CVSS 3.0CRITICAL 9.8
- TI-2018-03430 Missing authentication in Siemens SICLOCK TC100, SICLOCK TC400 CVSS 3.0CRITICAL 9.8
- TI-2018-03428 Resource management flaw in Siemens SICLOCK TC100, SICLOCK TC400 CVSS 3.0HIGH 8.2
- TI-2018-03432 A vulnerability has been identified in SICLOCK TC100 (All versions) and SICLOCK TC400… CVSS 3.0MEDIUM 6.5
- TI-2018-03433 Improper authentication in Siemens SICLOCK TC100, SICLOCK TC400 CVSS 3.0MEDIUM 4.9
Sources
- CVE-2018-4854 · CVE Program
- CVE-2018-4854 · NVD
- FIRST EPSS
- GHSA-w4g7-qqm9-9hj6 · GitHub Advisory Database · CC BY 4.0
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