A vulnerability has been identified in SICLOCK TC100 (All versions) and SICLOCK TC400 (All versions).

published 2018-07-03 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-16638

cvss: 9.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.7%; EPSS 2.7% chance of exploitation in 30 days, percentile 85%
public exploits: 0; none known

A vulnerability has been identified in SICLOCK TC100 (All versions) and SICLOCK TC400 (All versions). An attacker with network access to the device could potentially circumvent the authentication mechanism if he/she is able to obtain certain knowledge specific to the attacked device.

Exploit prediction

2.69% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	9.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

Siemens AG SICLOCK TC100, SICLOCK TC400

Classification

Weakness

CWE-288 Authentication Bypass Using an Alternate Path or Channel
CWE-287 Improper Authentication

References

cert-portal.siemens.com /productcert/pdf/ssa-197012.pdf
mitigation, vendor-advisory
securityfocus.com /bid/104672
vdb-entry, third-party-advisory

Sources

CVE List CVE-2018-4852
NVD CVE-2018-4852

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Summary