CVE-2021-37172

A vulnerability has been identified in SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (V4.5.0). Affected devices fail to authenticate against configured passwords when provisioned using TIA Portal V13. This could allow an attacker using TIA Portal V13 or later versions to bypass authentication and download arbitrary programs to the PLC. The vulnerability does not occur when TIA Portal V13 SP1 or any later version was used to provision the device.

• CWE-287
• CWE-287

• https://cert-portal.siemens.com/productcert/pdf/ssa-830194.pdfPatch, Vendor Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-830194.pdfPatch, Vendor Advisory

Published

Aug 10, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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