Siemens SIMATIC S7-1200 CPU V1 family up to 2.0.2 Web Server Interface denial of service

CVSS Meta Temp Score
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CTI Interest Score
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7.3$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Siemens SIMATIC S7-1200 CPU V1 family and SIMATIC S7-1200 CPU V2 family up to 2.0.2. This impacts an unknown function of the component Web Server Interface. This manipulation causes denial of service. This vulnerability appears as CVE-2011-20001. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Siemens SIMATIC S7-1200 CPU V1 family and SIMATIC S7-1200 CPU V2 family up to 2.0.2. It has been declared as critical. Affected by this vulnerability is some unknown functionality of the component Web Server Interface. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

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.

It is possible to read the advisory at cert-portal.siemens.com. This vulnerability is known as CVE-2011-20001 since 05/22/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 2.0.3 eliminates this vulnerability.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (siemens): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: SIMATIC S7-1200 CPU V1 family/SIMATIC S7-1200 CPU V2 family 2.0.3

Timelineinfo

05/22/2025 CVE reserved
10/14/2025 +145 days Advisory disclosed
10/14/2025 +0 days VulDB entry created
10/14/2025 +0 days VulDB entry last update

Sourcesinfo

Vendor: siemens.com

Advisory: ssa-625789
Status: Confirmed

CVE: CVE-2011-20001 (🔒)
GCVE (CVE): GCVE-0-2011-20001
GCVE (VulDB): GCVE-100-328183

Entryinfo

Created: 10/14/2025 11:51
Changes: 10/14/2025 11:51 (78)
Complete: 🔍
Cache ID: 216::103

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