CVE-2020-15796
mediumpriority · track · 31EPSS 0.016 · 76 %ileEUUSEPSS · scored 2026-10-27
A vulnerability has been identified in SIMATIC ET 200SP Open Controller (incl. SIPLUS variants) (V20.8), SIMATIC S7-1500 Software Controller (V20.8). The web server of the affected products contains a vulnerability that could allow a remote attacker to trigger a denial-of-service condition by sending a specially crafted HTTP request.
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
A vendor fix is available.
- FixedSIMATIC ET 200SP Open Controller (incl. SIPLUS variants)cisa_csaf_ot
If the PC Station web server does not restart automatically Windows reboot is required. This can be done while the control system is running as the PLC control functionality is not affected.
- FixedSIMATIC S7-1500 Software Controllercisa_csaf_ot
If the PC Station web server does not restart automatically Windows reboot is required. This can be done while the control system is running as the PLC control functionality is not affected.
- MitigationSIMATIC ET 200SP Open Controller (incl. SIPLUS variants)cisa_csaf_ot
As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity
- MitigationSIMATIC S7-1500 Software Controllercisa_csaf_ot
As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (8)
Products and version ranges known to be affected.
- siemens simatic et 200sp open controller firmware≤ 20.8nvdUScpe:2.3:o:siemens:simatic_et_200sp_open_controller_firmware:*:*:*:*:*:*:*:*
- siemens simatic s7-1500 software controller firmware≤ 20.8nvdUScpe:2.3:o:siemens:simatic_s7-1500_software_controller_firmware:*:*:*:*:*:*:*:*
advisories (1)
Vendor and ecosystem advisories describing this.
- ICSA-20-343-09Siemens SIMATIC Controller Web Servers2020-12-08icsa · cisa_csaf_otUS
Successful exploitation of this vulnerability could allow an attacker to cause a denial-of-service condition.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (8)
External citations — patches, advisories, analysis.
- https://cert-portal.siemens.com/productcert/pdf/SSA-700697.pdfPatchcnnvd
- https://cert-portal.siemens.com/productcert/pdf/ssa-700697.pdfcnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2020-15796cnnvd
- https://us-cert.cisa.gov/ics/advisories/icsa-20-343-09cnnvd
- https://vigilance.fr/vulnerability/Siemens-SIMATIC-denial-of-service-via-HTTP-Request-34071cnnvd
- https://www.auscert.org.au/bulletins/ESB-2020.4359/cnnvd
- https://cert-portal.siemens.com/productcert/pdf/ssa-700697.pdfenisa_euvd
- https://cert-portal.siemens.com/productcert/pdf/ssa-700697.pdfVendor Advisorynvd
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