CVE-2011-20001

HIGH

SIMATIC S7-1200 CPU V1 and V2 families < V2.0.3 - Unauthenticated Denial of Service via Malformed HTTP Traffic

Title source: llm

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.

References (1)

Core 1

Core References

Vendor Advisory

https://cert-portal.siemens.com/productcert/html/ssa-625789.html

Scores

CVSS v3 7.5

EPSS 0.0014

EPSS Percentile 33.5%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-20

Status published

Products (2)

Siemens/SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants) < V2.0.3

Siemens/SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) < V2.0.3

Published Oct 14, 2025

Tracked Since Feb 18, 2026