{"id":"CVE-2021-27241","state":"PUBLISHED","title":"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 firs","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.","publishedAt":"2021-03-29T21:05:31.000Z","updatedAt":"2024-08-03T20:48:15.888Z","severity":{"score":6.1,"label":"Medium","version":"3.0","vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H","source":"zdi"},"assigner":"zdi","products":["Avast Premium Security"],"affected":[{"vendor":"Avast","product":"Premium Security","versions":[{"version":"20.8.2429 (Build 20.8.5653.561)","status":"affected"}]}],"references":["https://www.zerodayinitiative.com/advisories/ZDI-21-208/"],"weaknesses":["CWE-59"],"ingestedAt":"2026-10-29T19:48:15.637Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/27xxx/CVE-2021-27241.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-27241","state":"PUBLISHED","datePublished":"2021-03-29T21:05:31.000Z","dateUpdated":"2024-08-03T20:48:15.888Z","assignerShortName":"zdi","assignerOrgId":"99f1926a-a320-47d8-bbb5-42feb611262e","dateReserved":"2021-02-16T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","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."}],"affected":[{"vendor":"Avast","product":"Premium Security","versions":[{"version":"20.8.2429 (Build 20.8.5653.561)","status":"affected"}]}],"references":[{"url":"https://www.zerodayinitiative.com/advisories/ZDI-21-208/","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_0":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H","version":"3.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-59","description":"CWE-59: Improper Link Resolution Before File Access ('Link Following')","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"zdi","dateUpdated":"2021-03-29T21:05:30.000Z","orgId":"99f1926a-a320-47d8-bbb5-42feb611262e"},"credits":[{"lang":"en","value":"Abdelhamid Naceri"}],"x_legacyV4Record":{"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."}]},"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"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-59: Improper Link Resolution Before File Access ('Link Following')"}]}]},"references":{"reference_data":[{"name":"https://www.zerodayinitiative.com/advisories/ZDI-21-208/","refsource":"MISC","url":"https://www.zerodayinitiative.com/advisories/ZDI-21-208/"}]}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://www.zerodayinitiative.com/advisories/ZDI-21-208/","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T20:48:15.888Z"}}]}}}