CVE-2011-20002Network attack vector

Controller command execution via replayed engineering traffic

Published Oct 14, 2025 · Updated Oct 14, 2025

Capture-replay in Siemens SIMATIC S7-1200 CPU firmware before 2.0.2 allows man-in-the-middle attackers to execute recorded commands. The controller accepts previously captured engineering-software traffic as fresh commands without verifying message freshness or password state. The attacker must first intercept legitimate engineering traffic; replay can alter process control or set the controller to STOP.

CVSS severity8.3
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Capture-replay in Siemens SIMATIC S7-1200 CPU firmware before 2.0.2 allows man-in-the-middle attackers to execute recorded commands. The controller accepts previously captured engineering-software traffic as fresh commands without verifying message freshness or password state. The attacker must first intercept legitimate engineering traffic; replay can alter process control or set the controller to STOP.

The record

CVE
CVE-2011-20002
Published
Oct 14, 2025
Updated
Oct 14, 2025
Vendor
Siemens
Product
SIMATIC S7-1200 CPU
Classifications
CWE-294, CAPEC-94, T1692.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <V2.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SIMATIC S7-1200 CPUversion=0 <V2.0.2

Published CVSS scores

7.4Siemens AGCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
8.3Siemens AGCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-294Authentication Bypass by Capture-replay
CAPEC-94Adversary in the Middle (AiTM)
T1692.001Unauthorized Message Command Message

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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