CVE-2021-42027
CVE-2021-42027 is a high-severity vulnerability in Siemens Sinumerik Edge with a CVSS 3.x base score of 7.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-295.
Key facts
- Severity: High (CVSS 3.x base score 7.4)
- CVSS v2: 5.8
- EPSS exploit prediction: 0% (38th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-295
- Affected product: Siemens Sinumerik Edge
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2021-42027?
- 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.
- How severe is CVE-2021-42027?
- CVE-2021-42027 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2021-42027 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-42027?
- CVE-2021-42027 affects Siemens Sinumerik Edge. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-42027?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-42027 published?
- CVE-2021-42027 was published on 2021-12-14 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:siemens:sinumerik_edge:*:*:*:*:*:*:*:*
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