CVE-2021-42027

Severity: high (CVSS 7.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-12-14 · updated 2026-06-17
Weakness: CWE-295

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.

Affected products

Siemens SINUMERIK Edge: before 3.2 — fixed in 3.2

How to fix

Upgrade to a fixed version: Siemens SINUMERIK Edge 3.2. Check the vendor advisory for mitigations.

References

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

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