{"schemaVersion":3,"id":"CVE-2021-34594","aliases":[],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2021-11-04T09:50:09.275Z","modified":"2024-09-16T22:03:44.063Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.5,"severity":"high","version":"2.0","versionLabel":"v2.0","source":"NVD","vector":"AV:N/AC:L/Au:S/C:N/I:C/A:C","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":8.5,"severity":"high","vector":"AV:N/AC:L/Au:S/C:N/I:C/A:C","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01126,"percentile":0.66006,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.01126},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.01126,"percentile":0.66006}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01126,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.01126,"percentile":0.66006}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-23","name":"Relative Path Traversal","description":"The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as \"..\" that can resolve to a location that is outside of that directory.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/23.html"},{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","description":"The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/22.html"}],"affected":[{"vendor":"beckhoff automation","product":"twincat opc ua server","name":"TwinCAT OPC UA Server","label":"twincat opc ua server","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ TF6100, < 4.3.48.0","noFixRecorded":false,"fixedIn":null},{"text":"≥ TS6100, < 4.3.48.0","noFixRecorded":false,"fixedIn":null},{"text":"≥ TcOpcUaServer version, < 3.2.0.19423","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ TF6100, < 4.3.48.0 | ≥ TS6100, < 4.3.48.0 | ≥ TcOpcUaServer version, < 3.2.0.19423","eol":null,"hubHref":"/vendor/beckhoff_automation/twincat_opc_ua_server"},{"vendor":"beckhoff","product":"tf6100_firmware","name":"tf6100 firmware","label":"tf6100_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 4.3.48.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.3.48.0","eol":null,"hubHref":"/vendor/beckhoff/tf6100"},{"vendor":"beckhoff","product":"ts6100_firmware","name":"ts6100 firmware","label":"ts6100_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 4.3.48.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.3.48.0","eol":null,"hubHref":"/vendor/beckhoff/ts6100"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://cert.vde.com/en/advisories/VDE-2021-051/","label":"cert.vde.com/en/advisories/VDE-2021-051/","hostname":"cert.vde.com","tags":["X Refsource CONFIRM","Mitigation","Third Party Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2021-11-04T09:50:09.275Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-09-16T22:03:44.063Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":34,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T02:12:21.241Z","stale":false,"partial":false}}