{"schemaVersion":3,"id":"CVE-2021-27018","aliases":["UBUNTU-CVE-2021-27018"],"status":"published","duplicateOf":null,"title":null,"description":"The mechanism which performs certificate validation was discovered to have a flaw that resulted in certificates signed by an internal certificate authority to not be properly validated. This issue only affects clients that are configured to utilize Tenable.sc as the vulnerability data source.","dates":{"published":"2021-08-30T17:56:05.000Z","modified":"2024-08-03T20:40:47.040Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":4.3,"severity":"medium","vector":"AV:N/AC:M/Au:N/C:N/I:P/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00541,"percentile":0.44335,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00541},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00541,"percentile":0.44335}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00541,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00541,"percentile":0.44335}]},"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-295","name":"Improper Certificate Validation","description":"The product does not validate, or incorrectly validates, a certificate.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/295.html"}],"affected":[{"vendor":"ubuntu","product":"puppet","name":"puppet","label":"puppet","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/puppet","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"puppet","product":"remediate","name":"remediate","label":"remediate","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 2.0.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.0.1","eol":null,"hubHref":"/vendor/puppet/remediate"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://puppet.com/security/cve/CVE-2021-27018","label":"puppet.com/security/cve/CVE-2021-27018","hostname":"puppet.com","tags":["X Refsource MISC","REPORT","Vendor Advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-27018","label":"ubuntu.com/security/CVE-2021-27018","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-27018","label":"www.cve.org/CVERecord?id=CVE-2021-27018","hostname":"www.cve.org","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2021-08-30T17:56:05.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-03T20:40:47.040Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T22:44:29.206Z","stale":false,"partial":false}}