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Vulnerability record · CVE-2021-37205 · published 9 February 2022

CVE-2021-37205: Siemens simatic drive controller cpu 1504d tf firmware memory leak vulnerability

Siemens · Simatic Drive Controller Cpu 1504d Tf Firmware

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.

7.5 CVSS 3.1 High EPSS 1.6% · top 24.6% CWE-401 · Memory leak
7.5CVSS 3.1 base score, v2 7.1
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
48Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

48 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://cert-portal.siemens.com/productcert/pdf/ssa-838121.pdf PatchVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-838121.pdf PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.7CVE-2023-28831Siemens simatic cloud connect 7 cc712 firmware integer overflow vulnerabilityThe OPC UA implementations (ANSI C and C++) in affected products contain an integer overflow vulnerability that could cause the application to run in…EPSS 1.1%7.8CVE-2022-38465Siemens simatic et 200 sp open controller cpu 1515sp pc2 firmware insufficiently protected credentials vulnerabilityA vulnerability has been identified in SIMATIC Drive Controller family (All versions < V2.9.2), SIMATIC ET 200SP Open Controller CPU 1515SP PC (incl.…EPSS 0.23%7.8CVE-2013-0700Siemens simatic s7-1200 firmware vulnerabilitySiemens SIMATIC S7-1200 PLCs 2.x and 3.x allow remote attackers to cause a denial of service (defect-mode transition and control outage) via crafted …EPSS 2.4%7.8CVE-2013-2780Siemens simatic s7-1200 firmware vulnerabilitySiemens SIMATIC S7-1200 PLCs 2.x and 3.x allow remote attackers to cause a denial of service (defect-mode transition and control outage) via crafted …EPSS 2.4%7.5CVE-2023-46156Siemens simatic drive controller cpu 1504d tf firmware use after free vulnerabilityAffected devices improperly handle specially crafted packets sent to port 102/tcp. This could allow an attacker to create a denial of service conditi…EPSS 1.2%7.5CVE-2021-40365Siemens simatic s7-plcsim advanced firmware improper input validation vulnerabilityAffected devices don't process correctly certain special crafted packets sent to port 102/tcp, which could allow an attacker to cause a denial of ser…EPSS 0.90%7.5CVE-2021-37204Siemens simatic drive controller cpu 1504d tf firmware vulnerabilityA vulnerability has been identified in SIMATIC Drive Controller family (All versions < V2.9.2), SIMATIC Drive Controller family (All versions >= V2.9…EPSS 2.2%7.5CVE-2021-37185Siemens simatic drive controller cpu 1504d tf firmware vulnerabilityA vulnerability has been identified in SIMATIC Drive Controller family (All versions >= V2.9.2 < V2.9.4), SIMATIC ET 200SP Open Controller CPU 1515SP…EPSS 2.1%

Source: NIST National Vulnerability Database (record CVE-2021-37205), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.