CVE-2021-42027

Name: CVE-2021-42027
Creator: NVD / NIST
Published: 2021-12-14T12:15:10.037+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.4/10EPSS 0.48%

Last modified Jun 17, 2026

CVE-2021-42027 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. 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. EPSS estimates a 0.48% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.4/10

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

EPSS Probability

0.48%

37.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

Affected Software

Vendor	Product	Versions
Siemens	Sinumerik Edge	< 3.2

References

https://cert-portal.siemens.com/productcert/pdf/ssa-523250.pdfPatch, Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-523250.pdfPatch, Vendor Advisory

Timeline

Published: Dec 14, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42027?

How severe is CVE-2021-42027?

CVE-2021-42027 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 0.48% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42027?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-42027?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST