CVE-2011-20001

highpriority · track · 0EPSS 0.005 · 40 %ileDEEUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.47% (40th) EPSS
CVSS 7.5 · high
Is it mine?
8 products
Check your exposure
Who says so?
4 sources
cnnvd · enisa_euvd · cisa_csaf_ot · siemens_psirt

EPSS · scored 2026-10-28

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.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • FixedSIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants)siemens_psirt

    Update to V2.0.3 or later version

  • FixedSIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants)siemens_psirt

    Update to V2.0.3 or later version

  • FixedSIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants)cisa_csaf_ot

    Update to V2.0.3 or later version

  • FixedSIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants)cisa_csaf_ot

    Update to V2.0.3 or later version

  • MitigationSIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants)siemens_psirt

    Disable the web server if possible

  • MitigationSIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants)siemens_psirt

    Disable the web server if possible

  • MitigationSIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants)cisa_csaf_ot

    Disable the web server if possible

  • MitigationSIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants)cisa_csaf_ot

    Disable the web server if possible

02

cvss

Technical severity, 0–10. One row per scoring source.

8.7
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.6–8.7

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · CISA US
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · productcert@siemens.com DEexploitability 3.9 · impact 3.6
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · Siemens ProductCERT DE
v4.08.7highCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:Nsecondary · ENISA EU
v4.08.7highCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · productcert@siemens.com DE
v4.06.6mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USCWE-20USCWE-20US
05

affected products (8)

Products and version ranges known to be affected.

06

advisories (2)

Vendor and ecosystem advisories describing this.

  • SSA-625789SSA-625789: Multiple Vulnerabilities in SIMATIC S7-1200 CPU V1/V2 Devices2011-06-10csaf · siemens_psirtDE

    SIMATIC S7-1200 CPU V1/V2 controllers contain two vulnerabilities that could allow an unauthenticated remote attacker - to trigger functions by record and playback of legitimate network communication, or - to place the controller in stop/defect state by causing a communications error. Siemens has released new versions for the affected products and recommends to update to the latest versions.

  • ICSA-25-294-03Siemens SIMATIC S7-1200 CPU V1/V2 Devices2011-06-10icsa · cisa_csaf_otUS

    SIMATIC S7-1200 CPU V1/V2 controllers contain two vulnerabilities that could allow an unauthenticated remote attacker - to trigger functions by record and playback of legitimate network communication, or - to place the controller in stop/defect state by causing a communications error. Siemens has released new versions for the affected products and recommends to update to the latest versions.

07

also known as (3)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcisa_csaf_otsiemens_psirtNVDCVE.orgMITRE
published 2025-10-14modified 2026-06-16
09

references (4)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan