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TI-2021-15234 Aliases CVE-2021-37172GHSA-jx4h-7jg8-gqhf

Improper authentication in Siemens SIMATIC S7-1200 CPU family

Priority LOW 35CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-287.

Summary

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.

Why it matters now

EPSS 0.00922 60th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
SiemensSIMATIC S7-1200 CPU family (incl. SIPLUS variants)V4.5.0—No fix listedCNA
  • SIMATIC S7-1200 CPU family (incl. SIPLUS variants) VendorSiemens Affected V4.5.0 Fixed in — No fix listed CNA

CPE configurations NVD · 10

CPEVersionsRoleVendor
cpe:2.3:o:siemens:simatic_s7-1200_cpu_firmware:4.5.0:*:*:*:*:*:*:*4.5.0VulnerableSiemens
cpe:2.3:h:siemens:cpu_1211c:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:h:siemens:cpu_1212c:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:h:siemens:cpu_1212fc:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:h:siemens:cpu_1214c:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:h:siemens:cpu_1214fc:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:h:siemens:cpu_1215c:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:h:siemens:cpu_1215fc:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:h:siemens:cpu_1217c:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:a:siemens:simatic_step_7_\(tia_portal\):*:*:*:*:*:*:*:*up to 13.0VulnerableSiemens
  • cpe:2.3:o:siemens:simatic_s7-1200_cpu_firmware:4.5.0:*:*:*:*:*:*:* Versions 4.5.0 Vulnerable ·Siemens
  • cpe:2.3:h:siemens:cpu_1211c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:h:siemens:cpu_1212c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:h:siemens:cpu_1212fc:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:h:siemens:cpu_1214c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:h:siemens:cpu_1214fc:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:h:siemens:cpu_1215c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:h:siemens:cpu_1215fc:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:h:siemens:cpu_1217c:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:a:siemens:simatic_step_7_\(tia_portal\):*:*:*:*:*:*:*:* Versions up to 13.0 Vulnerable ·Siemens

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-37172
  2. 2026-10-03 Alias added: GHSA-jx4h-7jg8-gqhf

References

Patch 1

  • TI-2023-13337 Integer overflow in Siemens SIMATIC BRAUMAT CVSS 4.0HIGH 8.7
  • TI-2019-08156 Uncontrolled resource consumption in Siemens Development/Evaluation Kits for PROFINET IO… CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences