Security readout for executives and security teams
Plain-English summary
This flaw can let an attacker bypass configured PLC passwords and download arbitrary logic to affected Siemens SIMATIC S7-1200 CPUs. The known exposure is narrow: V4.5.0 devices provisioned with TIA Portal V13. Devices provisioned with TIA Portal V13 SP1 or later are not affected, per the source bundle.
Executive priority
Treat this as high priority for industrial environments where S7-1200 PLCs control safety, production, or availability-sensitive processes. Urgency depends on whether V4.5.0 devices were provisioned with TIA Portal V13 and whether engineering access is tightly controlled.
Technical view
CVE-2021-37172 is a CWE-287 authentication weakness in SIMATIC S7-1200 CPU family, including SIPLUS variants, version V4.5.0. Password authentication can fail when the device was provisioned using TIA Portal V13, allowing unauthorized PLC program downloads via TIA Portal V13 or later.
Likely exposure
Organizations using Siemens SIMATIC S7-1200 or SIPLUS S7-1200 CPUs at V4.5.0 should check how each device was provisioned. Exposure is specifically tied to provisioning with TIA Portal V13, not V13 SP1 or later.
Exploitation context
The bundle does not cite active exploitation, and the CVE is not marked KEV. The described impact is serious because unauthorized program download to a PLC can affect industrial process integrity, but exploit prevalence is not established by the provided sources.
Researcher notes
Key uncertainty is scope beyond the bundle: no CVSS vector, no patch wording, and no exploitation evidence are provided. The strongest technical discriminator is provisioning history: TIA Portal V13 appears vulnerable, while V13 SP1 or later provisioning is stated as not vulnerable.
Mitigation direction
- Review Siemens SSA-830194 for vendor-specific remediation guidance.
- Identify S7-1200 V4.5.0 devices provisioned with TIA Portal V13.
- Reprovision affected devices using TIA Portal V13 SP1 or later where Siemens guidance supports it.
- Restrict engineering access to PLC networks while validation is underway.
Validation and detection
- Inventory SIMATIC S7-1200 and SIPLUS variants running V4.5.0.
- Confirm the TIA Portal version used to provision each device.
- Verify password protection behavior after reprovisioning or remediation.
- Document affected assets, remediation status, and remaining Siemens guidance gaps.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-287: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-37172 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://cert-portal.siemens.com/productcert/pdf/ssa-830194.pdfCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Authentication
Improper Authentication represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.