CVE-2021-25676 Denial of service in RUGGEDCOM RM1224

Q: Is CVE-2021-25676 being exploited?

There is no known exploitation of CVE-2021-25676 in the wild and no public exploit code.

Q: How do I fix CVE-2021-25676?

No fix has been published for CVE-2021-25676 yet. Limit exposure of the affected software until one is available.

High 7.5 Published 15 Mar 2021 Updated 3 Aug 2024

Multiple failed SSH authentication attempts can trigger a device reboot, causing a temporary denial of service on Siemens industrial network devices.

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-2021-25676?

CVE-2021-25676 is a high-severity denial of service vulnerability in Siemens RUGGEDCOM RM1224, published on 15 Mar 2021. 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 RUGGEDCOM RM1224 (V6.3), SCALANCE M-800 (V6.3), SCALANCE S615 (V6.3), SCALANCE SC-600 (All Versions >= V2.1 and < V2.1.3). Multiple failed SSH authentication attempts could trigger a temporary Denial-of-Service under certain conditions. When triggered, the device will reboot automatically.

Weakness: CWE-307

Which versions are affected by CVE-2021-25676?

It affects 4 products.

Products include Siemens Ruggedcom Rm1224 Firmware, Siemens Scalance M-800 Firmware, Siemens Scalance S615 Firmware, Siemens Scalance Sc-600 Firmware.

How do I fix CVE-2021-25676?

No fix has been published for CVE-2021-25676 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-2021-25676 being exploited?

There is no known exploitation of CVE-2021-25676 in the wild and no public exploit code.

Sources

Also known as GHSA-pg2c-638q-xw3m.