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Vulnerability record · CVE-2021-42027 · published 14 December 2021

CVE-2021-42027: Siemens sinumerik edge improper certificate validation vulnerability

Siemens · Sinumerik Edge

A vulnerability has been identified in SINUMERIK Edge (All versions < V3.2). The affected software does not properly validate the server certificate when initiating a TLS connection. This could allow an attacker to spoof a trusted entity by interfering in the communication path between the client and the intended server.

7.4 CVSS 3.1 High EPSS 0.48% · top 60.8% CWE-295 · Improper certificate validation
7.4CVSS 3.1 base score, v2 5.8
0.48%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A vulnerability has been identified in SINUMERIK Edge (All versions < V3.2). The affected software does not properly validate the server certificate when initiating a TLS connection. This could allow an attacker to spoof a trusted entity by interfering in the communication path between the client and the intended server.

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

Affected products

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

References

LinkTags
https://cert-portal.siemens.com/productcert/pdf/ssa-523250.pdf PatchVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-523250.pdf PatchVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-42027), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.