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Vulnerability record · CVE-2021-40365 · published 13 December 2022

CVE-2021-40365: Siemens simatic s7-plcsim advanced firmware improper input validation vulnerability

Siemens · Simatic S7 Plcsim Advanced Firmware

Affected devices don't process correctly certain special crafted packets sent to port 102/tcp, which could allow an attacker to cause a denial of service in the device.

7.5 CVSS 3.1 High EPSS 0.90% · top 42.1% CWE-20 · Improper input validation
7.5CVSS 3.1 base score
0.90%EPSS exploitation probability, 30 days
NoNot in CISA KEV
96Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Affected devices don't process correctly certain special crafted packets sent to port 102/tcp, which could allow an attacker to cause a denial of service in the device.

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

Affected products

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

References

LinkTags
https://cert-portal.siemens.com/productcert/pdf/ssa-382653.pdf PatchVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-382653.pdf PatchVendor Advisory

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

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Source: NIST National Vulnerability Database (record CVE-2021-40365), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.