CVE-2011-20001

State: Published
Severity: 8.7 High
Published: Oct 14, 2025
Updated: Oct 14, 2025
Reserved: May 22, 2025

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	siemens
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	siemens

Weaknesses

CWE-20 Improper Input Validation

Affected Products

Product	Versions
SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants)Siemens	before V2.0.3Affected
SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants)Siemens	before V2.0.3Affected

References

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

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