{"cve":{"cve_id":"CVE-2021-34594","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.0109,"epss_percentile":0.61056,"epss_as_of":"2026-06-23","description":"TwinCAT OPC UA Server in TF6100 and TS6100 in product versions before 4.3.48.0 or with TcOpcUaServer versions below 3.2.0.194 are prone to a relative path traversal that allow administrators to create or delete any files on the system.","published_at":"2021-11-04T09:50:09.275000Z","last_modified_at":null,"cvss_v3_score":6.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-23"],"nvd_references":["https://cert.vde.com/en/advisories/VDE-2021-051/"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:15:46.937111Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"H","value_label":"High"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"beckhoff-automation","vendor_name":"Beckhoff Automation","product_slug":"twincat-opc-ua-server","product_name":"TwinCAT OPC UA Server","version_start":"TF6100","version_start_inclusive":true,"version_end":"4.3.48.0","version_end_inclusive":false,"cpe23_uri":"cve5:beckhoff-automation:twincat-opc-ua-server:TF6100:4.3.48.0"},{"vendor_slug":"beckhoff-automation","vendor_name":"Beckhoff Automation","product_slug":"twincat-opc-ua-server","product_name":"TwinCAT OPC UA Server","version_start":"TS6100","version_start_inclusive":true,"version_end":"4.3.48.0","version_end_inclusive":false,"cpe23_uri":"cve5:beckhoff-automation:twincat-opc-ua-server:TS6100:4.3.48.0"},{"vendor_slug":"beckhoff-automation","vendor_name":"Beckhoff Automation","product_slug":"twincat-opc-ua-server","product_name":"TwinCAT OPC UA Server","version_start":"TcOpcUaServer version","version_start_inclusive":true,"version_end":"3.2.0.19423","version_end_inclusive":false,"cpe23_uri":"cve5:beckhoff-automation:twincat-opc-ua-server:TcOpcUaServer version:3.2.0.19423"}],"exploit_refs":[],"news":[],"references":[{"url":"https://cert.vde.com/en/advisories/VDE-2021-051/","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2021-11-04T09:50:09.275000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:18:42.945001Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:18:42.945001Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:18:42.945001Z","label":"CVSS score revised","source":"cvelistv5"}]}