Improper Certificate Validation Vulnerability in SINUMERIK Edge
Plan Patch7.4SSA-523250Dec 14, 2021
Attack VectorNetwork
Auth RequiredNone
ComplexityHigh
User InteractionNone needed
Summary
SINUMERIK Edge versions prior to 3.2 contain an improper certificate validation vulnerability (CWE-295) that allows an attacker positioned on the network path between a client and server to spoof the trusted SINUMERIK Edge server. The attacker could intercept communications and credentials without triggering authentication warnings.
What this means
What could happen
An attacker positioned on the network path between a client and SINUMERIK Edge server could intercept and spoof the server, potentially capturing credentials or injecting commands into the control system without detection.
Who's at risk
Manufacturers and integrators using SINUMERIK Edge for remote machine monitoring or control. This affects CNC machine tool operators and maintenance staff who connect to SINUMERIK Edge instances over the network, particularly in environments where engineering or diagnostics workstations communicate with edge controllers.
How it could be exploited
An attacker would need to be on the network path between a client and the SINUMERIK Edge server (via ARP spoofing, DNS hijacking, or network position). They would then present a forged certificate, which the vulnerable client would accept due to improper certificate validation, allowing the attacker to intercept or modify communications.
Prerequisites
- Network position on the data path between client and server (man-in-the-middle capability)
- SINUMERIK Edge version prior to 3.2
Remotely exploitableNo authentication required for initial connection spoofingLow complexity exploitationAffects device communication integrity
Exploitability
Low exploit probability (EPSS 0.1%)
Affected products (1)
ProductAffected VersionsFix Status
SINUMERIK Edge< V3.23.2
Remediation & Mitigation
0/1
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HOTFIXUpdate SINUMERIK Edge to version 3.2 or later
CVEs (1)
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/api/v1/advisories/10fe0dc7-cc4b-47ba-b2b4-12f0b1746d34