CVE-2011-20001

HIGH

7.5

CVSS Score

Published: October 14, 2025 at 09:14 AM UTC

Updated: June 16, 2026 at 11:30 PM UTC

1 product affected across 1 vendorSIMATIC S7-1200

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Severity

HIGH7.5

Exploit prediction

EPSS 0.5%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

SIMATIC S7-1200 · Siemens

60%

v < V2.0.3

Affected range stops below V2.0.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: cverecord

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHsiemens

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-20

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