CVE-2011-20002
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Publication date: 2025-10-14

Last updated on: 2025-10-14

Assigner: Siemens AG

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.

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Meta Information

Published
2025-10-14
Last Modified
2025-10-14
Generated
2026-07-06
AI Q&A
2025-10-14
EPSS Evaluated
2026-07-04
NVD
CVE-2011-20002
EUVD
EUVD-2011-5261

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
siemens simatic_s7-1200_cpu_v2 *
siemens simatic_s7-1200_cpu_v1 *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-294 A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).

Attack-Flow Graph

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Executive Summary

CVE-2011-20002 is a capture-replay vulnerability affecting Siemens SIMATIC S7-1200 CPU V1 and V2 family controllers. An attacker positioned between the engineering software and the controller can record legitimate commands sent to the controller and replay them later to execute unauthorized actions, such as setting the controller to STOP. This attack can be performed regardless of whether the controller has a password configured. [1]

Impact Analysis

This vulnerability can allow an attacker to execute previously recorded commands on the controller at a later time, potentially disrupting industrial processes by stopping the controller or causing other unauthorized actions. This can lead to operational downtime, safety risks, and loss of control over critical industrial systems. [1]

Detection Guidance

The vulnerability CVE-2011-20002 involves capture-replay attacks on communication between the engineering software and the SIMATIC S7-1200 CPU controllers. Detection would involve monitoring network traffic for repeated or replayed command sequences between the engineering software and the controller. Specific commands are not provided in the resources, but network traffic analysis tools (e.g., Wireshark) could be used to capture and analyze communication patterns for replayed commands. [1]

Mitigation Strategies

To mitigate CVE-2011-20002, Siemens recommends updating affected SIMATIC S7-1200 CPU V1 and V2 family controllers to firmware version V2.0.2 or later. Additionally, general security best practices should be followed, such as protecting network access with appropriate mechanisms and configuring the operational environment according to Siemens' Industrial Security guidelines. [1]

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