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Vulnerabilities

Vulnerability · CVE-2011-20001

A vulnerability has been identified in SIMATIC S7-1200 CPU V1 family (incl.

Published Oct 14, 2025 · catalog updated Oct 14, 2025 · Siemens SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants)

Last checked Nov 1, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2011-20001. EPSS is 0.47%. Act only if a listed version of Siemens SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.47%
Remediation
Version ranges on file
Affected products
vendor Siemens SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) 0 <V2.0.3

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Siemens SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) 0 <V2.0.30 <V2.0.3

How to fix CVE-2011-20001

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2011-20001. EPSS is 0.47%. Act only if a listed version of Siemens SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) is installed.

Which versions are affected?

Compare what you have installed with Siemens SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) 0 <V2.0.3 0 <V2.0.3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.47%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 14, 2025 · EUVD

    Detected

    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/d

  2. Oct 14, 2025 · EUVD

    Updated

    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/d

Sources

  • CVE.orgVulnerability recordCVE-2011-20001

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2011-20001

    30-day exploitation probability 0.47%

    first.org
  • EUVDVulnerability recordEUVD-2011-5262

    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 malforme

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 23, 2026
  • FIRST EPSSOct 23, 2026
  • EUVDOct 23, 2026