{"schemaVersion":3,"id":"CVE-2021-38505","aliases":["UBUNTU-CVE-2021-38505"],"status":"published","duplicateOf":null,"title":null,"description":"Microsoft introduced a new feature in Windows 10 known as Cloud Clipboard which, if enabled, will record data copied to the clipboard to the cloud, and make it available on other computers in certain scenarios. Applications that wish to prevent copied data from being recorded in Cloud History must use specific clipboard formats; and Firefox before versions 94 and ESR 91.3 did not implement them. This could have caused sensitive data to be recorded to a user's Microsoft account. *This bug only affects Firefox for Windows 10+ with Cloud Clipboard enabled. Other operating systems are unaffected.*. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.","dates":{"published":"2021-12-08T21:21:53.000Z","modified":"2024-08-04T01:44:23.530Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.5,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","exploitability":7.2,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/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:P/I:N/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01084,"percentile":0.64956,"severity":"low","asOf":"2026-10-22T00:00:00.000Z","change":{"pp":0.034,"baselineDate":"2026-09-22T00:00:00.000Z","baselineScore":0.0105},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.01084,"percentile":0.64956}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.0105,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.01084,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.01084,"percentile":0.64956}]},"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-668","name":"Exposure of Resource to Wrong Sphere","description":"The product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource.","type":"weakness","status":"Draft","abstraction":"Class","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/668.html"}],"affected":[{"vendor":"ubuntu","product":"mozjs38","name":"mozjs38","label":"mozjs38","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mozjs38","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"mozjs52","name":"mozjs52","label":"mozjs52","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mozjs52","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"mozjs68","name":"mozjs68","label":"mozjs68","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mozjs68","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"mozjs78","name":"mozjs78","label":"mozjs78","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/mozjs78","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"mozilla","product":"firefox","name":"Firefox","label":"firefox","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < 94","noFixRecorded":false,"fixedIn":null},{"text":"< 94.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < 94 | < 94.0","eol":{"isEol":null,"eolDate":null,"matchMethod":"cpe","cycle":null,"product":{"name":"firefox","label":"Firefox","category":"app"}},"hubHref":"/vendor/mozilla/firefox"},{"vendor":"mozilla","product":"firefox_esr","name":"firefox esr","label":"firefox_esr","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < 91.3","noFixRecorded":false,"fixedIn":null},{"text":"< 91.3.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < 91.3 | < 91.3.0","eol":null,"hubHref":"/vendor/mozilla/firefox_esr"},{"vendor":"mozilla","product":"thunderbird","name":"Thunderbird","label":"thunderbird","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < 91.3","noFixRecorded":false,"fixedIn":null},{"text":"< 91.3.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < 91.3 | < 91.3.0","eol":null,"hubHref":"/vendor/mozilla/thunderbird"}],"affectedCount":7,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.mozilla.org/security/advisories/mfsa2021-49/","label":"www.mozilla.org/security/advisories/mfsa2021-49/","hostname":"www.mozilla.org","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://www.mozilla.org/security/advisories/mfsa2021-50/","label":"www.mozilla.org/security/advisories/mfsa2021-50/","hostname":"www.mozilla.org","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://www.mozilla.org/security/advisories/mfsa2021-48/","label":"www.mozilla.org/security/advisories/mfsa2021-48/","hostname":"www.mozilla.org","tags":["X Refsource MISC","Vendor Advisory"]},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1730194","label":"bugzilla.mozilla.org/show_bug.cgi?id=1730194","hostname":"bugzilla.mozilla.org","tags":["X Refsource MISC","Issue Tracking","Permissions Required","Vendor Advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-38505","label":"ubuntu.com/security/CVE-2021-38505","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2021-48/#CVE-2021-38505","label":"www.mozilla.org/en-US/security/advisories/mfsa2021-48/","hostname":"www.mozilla.org","tags":["REPORT"]},{"url":"https://www.mozilla.org/en-US/security/advisories/mfsa2021-49/#CVE-2021-38505","label":"www.mozilla.org/en-US/security/advisories/mfsa2021-49/","hostname":"www.mozilla.org","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-38505","label":"www.cve.org/CVERecord?id=CVE-2021-38505","hostname":"www.cve.org","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2021:1635-1","OPENSUSE-SU-2021:3745-1","OPENSUSE-SU-2021:4150-1","OPENSUSE-SU-2024:11607-1","OPENSUSE-SU-2024:11614-1","OPENSUSE-SU-2024:14572-1","SUSE-SU-2021:3651-1","SUSE-SU-2021:3721-1","SUSE-SU-2021:3745-1","SUSE-SU-2021:4150-1"],"duplicates":[],"related":["OPENSUSE-SU-2021:1635-1","OPENSUSE-SU-2021:3745-1","OPENSUSE-SU-2021:4150-1","OPENSUSE-SU-2024:11607-1","OPENSUSE-SU-2024:11614-1","OPENSUSE-SU-2024:14572-1","SUSE-SU-2021:3651-1","SUSE-SU-2021:3721-1","SUSE-SU-2021:3745-1","SUSE-SU-2021:4150-1"]},"timeline":[{"kind":"published","date":"2021-12-08T21:21:53.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-04T01:44:23.530Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":26,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T21:14:08.737Z","stale":false,"partial":false}}