CVE-2011-20001
Unknown Unknown - Not Provided
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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 < V2.0.3), SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) (All versions < V2.0.3). The web server interface of affected devices improperly processes incoming malformed HTTP traffic at high rate. This could allow an unauthenticated remote attacker to force the device entering the stop/defect state, thus creating a denial of service condition.
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Meta Information
Published
2025-10-14
Last Modified
2025-10-14
Generated
2026-06-16
AI Q&A
2025-10-14
EPSS Evaluated
2026-06-14
NVD
CVE-2011-20001
EUVD
EUVD-2011-5262
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
siemens s7-1200_cpu 2.0
siemens s7-1200_cpu 2.0.3
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
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Executive Summary

This vulnerability affects the SIMATIC S7-1200 CPU V1 and V2 families (including SIPLUS variants) with versions below 2.0.3. The web server interface on these devices improperly handles a high rate of malformed HTTP traffic, which can allow an unauthenticated remote attacker to cause the device to enter a stop or defect state, resulting in a denial of service condition.

Impact Analysis

An attacker exploiting this vulnerability can remotely cause the affected SIMATIC S7-1200 devices to stop functioning properly by forcing them into a stop or defect state. This leads to a denial of service, potentially disrupting operations that rely on these devices.

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