CVE-2021-37205 - CVE House
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Status published High CVE-2021-37205

A vulnerability has been identified in SIMATIC Drive Controller family...

Vulnerability Description

A vulnerability has been identified in SIMATIC Drive Controller family (All versions >= V2.9.2 < V2.9.4), SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) (All versions >= V21.9 < V21.9.4), SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (All versions >= V4.5.0 < V4.5.2), SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions >= V2.9.2 < V2.9.4), SIMATIC S7-1500 Software Controller (All versions >= V21.9 < V21.9.4), SIMATIC S7-PLCSIM Advanced (All versions >= V4.0 < V4.0 SP1), SIPLUS TIM 1531 IRC (All versions < V2.3.6), TIM 1531 IRC (All versions < V2.3.6). An unauthenticated attacker could cause a denial-of-service condition in a PLC when sending specially prepared packets over port 102/tcp. A restart of the affected device is needed to restore normal operations.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

Affected Vendor

Affected Software

SIMATIC Drive Controller family, SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants), SIMATIC S7-1200 CPU family (incl. SIPLUS variants), SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants), SIMATIC S7-1500 Software Controller, SIMATIC S7-PLCSIM Advanced, SIPLUS TIM 1531 IRC, TIM 1531 IRC
Vulnerable Versions:
All versions >= V2.9.2 < V2.9.4, All versions >= V21.9 < V21.9.4, All versions >= V4.5.0 < V4.5.2, All versions >= V4.0 < V4.0 SP1, All versions < V2.3.6

Timeline

Official Publish: February 9th, 2022
Last Modified: April 18th, 2025
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C

Weaknesses (CWE)