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TI-2011-04646 Aliases CVE-2011-20002GHSA-3p9h-r6fg-7r7h

Authentication bypass by capture-replay in Siemens SIMATIC S7-1200 CPU V1 family

Priority LOW 36CWE-294Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-294.

Summary

A vulnerability has been identified in SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants) (All versions < V2.0.2), SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) (All versions < V2.0.2). Affected controllers are vulnerable to capture-replay in the communication with the engineering software. This could allow an on-path attacker between the engineering software and the controller to execute any previously recorded commands at a later time (e.g. set the controller to STOP), regardless whether or not the controller had a password configured.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00306 23rd percentileScored 2026-11-07
Fix Fixed SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants) (Siemens): V2.0.2SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) (Siemens): V2.0.2

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 V2.0.2V2.0.2Patch availableCNA
SiemensSIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants)before V2.0.2V2.0.2Patch availableCNA
  • SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants) VendorSiemens Affected before V2.0.2 Fixed in V2.0.2 Patch available CNA
  • SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) VendorSiemens Affected before V2.0.2 Fixed in V2.0.2 Patch available CNA

Remediation

  • Fix · CNA SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants) (Siemens) Fixed in V2.0.2
  • Fix · CNA SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) (Siemens) Fixed in V2.0.2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2011-20002
  2. 2026-10-03 Alias added: GHSA-3p9h-r6fg-7r7h

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
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Sources

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