{"schemaVersion":3,"id":"CVE-2021-35939","aliases":["UBUNTU-CVE-2021-35939","DEBIAN-CVE-2021-35939"],"status":"published","duplicateOf":null,"title":null,"description":"It was found that the fix for CVE-2017-7500 and CVE-2017-7501 was incomplete: the check was only implemented for the parent directory of the file to be created. A local unprivileged user who owns another ancestor directory could potentially use this flaw to gain root privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.","dates":{"published":"2022-08-26T00:00:00.000Z","modified":"2024-08-04T00:40:47.449Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.7,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":6.7,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","exploitability":2.1,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":6.7,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","exploitability":2.1,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.7,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00502,"percentile":0.41723,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":-0.0040000000000000105,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00506},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00502,"percentile":0.41723}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00506,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00502,"percentile":0.41723}]},"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":[{"id":"REF_A7DB0B3932F42D34","name":"Exploit Reference (bugzilla.redhat.com)","source":"reference","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1964129","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null}],"exploitCount":1,"weaknesses":[{"id":"CWE-59","name":"Improper Link Resolution Before File Access ('Link Following')","description":"The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/59.html"}],"affected":[{"vendor":"debian","product":"rpm","name":"rpm","label":"rpm","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/rpm","purlType":"deb","versions":[{"text":"< 4.18.0+dfsg-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.18.0+dfsg-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"rpm","name":"rpm","label":"rpm","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/rpm","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"redhat","product":"enterprise_linux","name":"enterprise linux","label":"enterprise_linux","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"8.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"8.0","eol":{"isEol":false,"eolDate":"2029-05-31T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"8","label":"8 (Upcoming ELS)","eolFrom":"2029-05-31T00:00:00.000Z","isLts":false,"isMaintained":true,"latestVersion":"8.10"},"product":{"name":"rhel","label":"Red Hat Enterprise Linux","category":"os"}},"hubHref":"/vendor/redhat/enterprise_linux"},{"vendor":"rpm","product":"rpm","name":"rpm","label":"rpm","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 4.18","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.18","eol":null,"hubHref":"/vendor/rpm/rpm"}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://rpm.org/wiki/Releases/4.18.0","label":"rpm.org/wiki/Releases/4.18.0","hostname":"rpm.org","tags":["Release Notes","Vendor Advisory"]},{"url":"https://github.com/rpm-software-management/rpm/pull/1919","label":"github.com/rpm-software-management/rpm/pull/1919","hostname":"github.com","tags":["Patch","Third Party Advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1964129","label":"bugzilla.redhat.com/show_bug.cgi?id=1964129","hostname":"bugzilla.redhat.com","tags":["REPORT","Exploit","Issue Tracking","Third Party Advisory"]},{"url":"https://github.com/rpm-software-management/rpm/commit/96ec957e281220f8e137a2d5eb23b83a6377d556","label":"github.com/rpm-software-management/rpm/commit/96ec957e281220f8e137a2d5eb23b83a6377d556","hostname":"github.com","tags":["Patch","Third Party Advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-35939","label":"access.redhat.com/security/cve/CVE-2021-35939","hostname":"access.redhat.com","tags":["Third Party Advisory"]},{"url":"https://security.gentoo.org/glsa/202210-22","label":"security.gentoo.org/glsa/202210-22","hostname":"security.gentoo.org","tags":["Vendor Advisory","Third Party Advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-35939","label":"ubuntu.com/security/CVE-2021-35939","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-35939","label":"www.cve.org/CVERecord?id=CVE-2021-35939","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-35939","label":"security-tracker.debian.org/tracker/CVE-2021-35939","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-35939","label":"nvd.nist.gov/vuln/detail/CVE-2021-35939","hostname":"nvd.nist.gov","tags":["Oval","Advisory"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2024:12562-1","RHSA-2024:0424","RHSA-2024:0435","RHSA-2024:0453","RHSA-2024:0463","RHSA-2024:0582","RHSA-2024:0647"],"duplicates":[],"related":["OPENSUSE-SU-2024:12562-1"]},"timeline":[{"kind":"published","date":"2022-08-26T00:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-04T00:40:47.449Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":37,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T01:00:31.637Z","stale":false,"partial":false}}