CVE-2018-4851 Denial of service in SICLOCK TC100, SICLOCK TC400

High 8.2 Published 3 Jul 2018 Updated 17 Sep 2024

An attacker can cause a denial-of-service condition on SICLOCK time servers by sending specific network packets, leading to device reboots.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-4851?

CVE-2018-4851 is a high-severity denial of service vulnerability in Siemens AG SICLOCK TC100, SICLOCK TC400, published on 3 Jul 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability has been identified in SICLOCK TC100 (All versions) and SICLOCK TC400 (All versions). An attacker with network access to the device could cause a Denial-of-Service condition by sending certain packets to the device, causing potential reboots of the device. The core functionality of the device could be impacted. The time serving functionality recovers when time synchronization with GPS devices or other NTP servers are completed.

Weakness: CWE-20, CWE-399

Which versions are affected by CVE-2018-4851?

It affects 2 products.

Products include Siemens Siclock Tc100 Firmware, Siemens Siclock Tc400 Firmware.

How do I fix CVE-2018-4851?

No fix has been published for CVE-2018-4851 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2018-4851 being exploited?

There is no known exploitation of CVE-2018-4851 in the wild and no public exploit code.

Sources

Also known as GHSA-x4qq-cpcc-jfwx.