{"api_version":"1","generated_at":"2026-04-23T09:41:03+00:00","cve":"CVE-2021-27241","urls":{"html":"https://cve.report/CVE-2021-27241","api":"https://cve.report/api/cve/CVE-2021-27241.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-27241","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-27241"},"summary":{"title":"CVE-2021-27241","description":"This vulnerability allows local attackers to delete arbitrary directories on affected installations of Avast Premium Security 20.8.2429 (Build 20.8.5653.561). An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the AvastSvc.exe module. By creating a directory junction, an attacker can abuse the service to delete a directory. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-12082.","state":"PUBLIC","assigner":"zdi-disclosures@trendmicro.com","published_at":"2021-03-29 21:15:00","updated_at":"2021-04-01 16:04:00"},"problem_types":["CWE-59"],"metrics":[],"references":[{"url":"https://www.zerodayinitiative.com/advisories/ZDI-21-208/","name":"N/A","refsource":"N/A","tags":[],"title":"ZDI-21-208 | Zero Day Initiative","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-27241","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27241","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"27241","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"avast","cpe5":"premium_security","cpe6":"20.8.2429","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"zdi-disclosures@trendmicro.com","ID":"CVE-2021-27241","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Premium Security","version":{"version_data":[{"version_value":"20.8.2429 (Build 20.8.5653.561)"}]}}]},"vendor_name":"Avast"}]}},"credit":"Abdelhamid Naceri","data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"This vulnerability allows local attackers to delete arbitrary directories on affected installations of Avast Premium Security 20.8.2429 (Build 20.8.5653.561). An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the AvastSvc.exe module. By creating a directory junction, an attacker can abuse the service to delete a directory. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-12082."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-59: Improper Link Resolution Before File Access ('Link Following')"}]}]},"references":{"reference_data":[{"url":"https://www.zerodayinitiative.com/advisories/ZDI-21-208/","refsource":"MISC","name":"https://www.zerodayinitiative.com/advisories/ZDI-21-208/"}]},"impact":{"cvss":{"vectorString":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H","version":"3.0"}}},"nvd":{"publishedDate":"2021-03-29 21:15:00","lastModifiedDate":"2021-04-01 16:04:00","problem_types":["CWE-59"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"HIGH","baseScore":6.1,"baseSeverity":"MEDIUM"},"exploitabilityScore":1.8,"impactScore":4.2},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:L/AC:L/Au:N/C:N/I:P/A:P","accessVector":"LOCAL","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL","baseScore":3.6},"severity":"LOW","exploitabilityScore":3.9,"impactScore":4.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:avast:premium_security:20.8.2429:*:*:*:*:*:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"27241","Ordinal":"202332","Title":"CVE-2021-27241","CVE":"CVE-2021-27241","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"27241","Ordinal":"1","NoteData":"This vulnerability allows local attackers to delete arbitrary directories on affected installations of Avast Premium Security 20.8.2429 (Build 20.8.5653.561). An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the AvastSvc.exe module. By creating a directory junction, an attacker can abuse the service to delete a directory. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-12082.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"27241","Ordinal":"2","NoteData":"2021-03-29","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"27241","Ordinal":"3","NoteData":"2021-03-29","Type":"Other","Title":"Modified"}]}}}