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TI-2011-04645 Aliases CVE-2011-20001GHSA-hfrj-93xv-cmrv

Improper input validation in Siemens SIMATIC S7-1200 CPU V1 family

Priority LOW 38CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00468 40th percentileScored 2026-11-07
Fix Fixed SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants) (Siemens): V2.0.3SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) (Siemens): V2.0.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SiemensSIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants)before V2.0.3V2.0.3Patch availableCNA
SiemensSIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants)before V2.0.3V2.0.3Patch availableCNA
  • SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants) VendorSiemens Affected before V2.0.3 Fixed in V2.0.3 Patch available CNA
  • SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) VendorSiemens Affected before V2.0.3 Fixed in V2.0.3 Patch available CNA

Remediation

  • Fix · CNA SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants) (Siemens) Fixed in V2.0.3
  • Fix · CNA SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) (Siemens) Fixed in V2.0.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2011-20001
  2. 2026-10-03 Alias added: GHSA-hfrj-93xv-cmrv

References

Other 1

  • TI-2026-20057 Authentication bypass in Fortinet FortiWeb KEVCVSS 3.1CRITICAL 9.4
  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-18911 Heap-based buffer overflow in Fortinet FortiSwitchManager KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-09686 Type confusion in Google Chrome KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-07142 Code injection in Spring Framework KEVCVSS 3.1CRITICAL 9.8
  • TI-2021-19919 Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints KEVCVSS 3.1CRITICAL 10.0
See all 2487 →

Sources

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