CVE-2011-20002 Other in SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants)
An on-path attacker can replay recorded commands to control Siemens S7-1200 PLCs, bypassing password protection and potentially stopping the controller.
- 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-2011-20002?
CVE-2011-20002 is a high-severity vulnerability in Siemens SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants), published on 14 Oct 2025. 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 SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants) (All versions < V2.0.2), SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) (All versions < V2.0.2). Affected controllers are vulnerable to capture-replay in the communication with the engineering software. This could allow an on-path attacker between the engineering software and the controller to execute any previously recorded commands at a later time (e.g. set the controller to STOP), regardless whether or not the controller had a password configured.
Weakness: CWE-294
Which versions are affected by CVE-2011-20002?
How do I fix CVE-2011-20002?
No fix has been published for CVE-2011-20002 yet. Limit exposure of the affected software until one is available.
Is CVE-2011-20002 being exploited?
There is no known exploitation of CVE-2011-20002 in the wild and no public exploit code.
Sources
Also known as GHSA-3p9h-r6fg-7r7h.