01 Record

CVE-2022-41648

The HEIDENHAIN Controller TNC 640 NC software Version 340590 07 SP5, is vulnerable to improper authentication in its DNC communication for CNC machines. Authentication is not enabled by default for

CriticalPUBLISHEDCNA: icscert

CNA base score9.2 CVSS v4.0CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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02 Description

The HEIDENHAIN Controller TNC 640 NC software Version 340590 07 SP5, is vulnerable to improper authentication in its DNC communication for CNC machines. Authentication is not enabled by default for

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.87% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 58.5% of scored records. A rank, not a probability.

NVD base score

9.2 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2022-10-28 17:09Z4 YR AGO

Last updated

2025-10-13 12:09Z1 YR AGO

Reserved

2022-09-29

Assigning CNA

icscert

Record state

PUBLISHED

Severity

Critical (CVSS 9.2)

CNA CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Weaknesses

CWE-1188Initialization of a Resource with an Insecure DefaultBase
CWE-287Improper AuthenticationClass

Data version

5.1

Document digest

7320fcbb38a4444aad21040d9e918c14ec379264ed8125987b399067255e41f8

05 Affected products

VendorProductVersionsPlatforms

HEIDENHAINHEIDENHAIN Controller TNC 640 NC Software340590 07 SP5—

06 References

www.cisa.govhttps://www.cisa.gov/news-events/ics-advisories/icsa-22-298-02government-resource
www.cisa.govhttps://www.cisa.gov/uscert/ics/advisories/icsa-22-298-02

07 Remediation

HEIDENHAIN has identified the following specific workarounds and mitigations users can apply to reduce risk: * Block LSV2 and DNC communication using the integrated firewall in the controller's operating system. * Use zone firewalls to isolate and segment the network of the affected devices. * Ask your machinery vendor (running HEIDENHAIN controllers) for updates to a recent software version, where SSH tunneling is standard.