CVE-2020-25236 Denial of service in LOGO! 12/24RCE

Medium 5.5 Published 15 Mar 2021 Updated 8 Oct 2024

Attackers can manipulate control logic to crash Siemens LOGO! devices, requiring manual reset to restore operation.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2020-25236?

CVE-2020-25236 is a medium-severity denial of service vulnerability in Siemens LOGO! 12/24RCE, published on 15 Mar 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

A vulnerability has been identified in LOGO! 12/24RCE (6ED1052-1MD08-0BA1) (All versions), LOGO! 12/24RCEo (6ED1052-2MD08-0BA1) (All versions), LOGO! 230RCE (6ED1052-1FB08-0BA1) (All versions), LOGO! 230RCEo (6ED1052-2FB08-0BA1) (All versions), LOGO! 24CE (6ED1052-1CC08-0BA1) (All versions), LOGO! 24CEo (6ED1052-2CC08-0BA1) (All versions), LOGO! 24RCE (6ED1052-1HB08-0BA1) (All versions), LOGO! 24RCEo (6ED1052-2HB08-0BA1) (All versions), SIPLUS LOGO! 12/24RCE (6AG1052-1MD08-7BA1) (All versions), SIPLUS LOGO! 12/24RCEo (6AG1052-2MD08-7BA1) (All versions), SIPLUS LOGO! 230RCE (6AG1052-1FB08-7BA1) (All versions), SIPLUS LOGO! 230RCEo (6AG1052-2FB08-7BA1) (All versions), SIPLUS LOGO! 24CE (6AG1052-1CC08-7BA1) (All versions), SIPLUS LOGO! 24CEo (6AG1052-2CC08-7BA1) (All versions), SIPLUS LOGO! 24RCE (6AG1052-1HB08-7BA1) (All versions), SIPLUS LOGO! 24RCEo (6AG1052-2HB08-7BA1) (All versions). The control logic (CL) the LOGO! 8 executes could be manipulated in a way that could cause the device executing the CL to improperly handle the manipulation and crash. After successful execution of the attack, the device needs to be manually reset.

Weakness: CWE-755

Which versions are affected by CVE-2020-25236?

It affects 1 product.

Products include Siemens Logo\! 8 Bm Firmware.

How do I fix CVE-2020-25236?

No fix has been published for CVE-2020-25236 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-2020-25236 being exploited?

There is no known exploitation of CVE-2020-25236 in the wild and no public exploit code.

Sources

Also known as GHSA-xv3q-r363-84pg.