{"schemaVersion":3,"id":"CVE-2020-9320","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Avira AV Engine before 8.3.54.138 allows virus-detection bypass via a crafted ISO archive. This affects versions before 8.3.54.138 of Antivirus for Endpoint, Antivirus for Small Business, Exchange Security (Gateway), Internet Security Suite for Windows, Prime, Free Security Suite for Windows, and Cross Platform Anti-malware SDK. NOTE: Vendor asserts that vulnerability does not exist in product","dates":{"published":"2020-02-20T21:39:43.000Z","modified":"2024-08-04T10:26:16.367Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.5,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.5,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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":0.02882,"percentile":0.86657,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.02882},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02882,"percentile":0.86657}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02882,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02882,"percentile":0.86657}]},"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-434","name":"Unrestricted Upload of File with Dangerous Type","description":"The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/434.html"}],"affected":[{"vendor":"avira","product":"anti-malware_sdk","name":"anti-malware sdk","label":"anti-malware_sdk","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 8.3.54.138","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 8.3.54.138","eol":null,"hubHref":"/vendor/avira/anti-malware_sdk"},{"vendor":"avira","product":"antivirus_server","name":"antivirus server","label":"antivirus_server","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 8.3.54.138","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 8.3.54.138","eol":null,"hubHref":"/vendor/avira/antivirus_server"},{"vendor":"avira","product":"avira_antivirus_for_endpoint","name":"avira antivirus for endpoint","label":"avira_antivirus_for_endpoint","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 8.3.54.138","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 8.3.54.138","eol":null,"hubHref":"/vendor/avira/avira_antivirus_for_endpoint"},{"vendor":"avira","product":"avira_antivirus_for_small_business","name":"avira antivirus for small business","label":"avira_antivirus_for_small_business","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 8.3.54.138","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 8.3.54.138","eol":null,"hubHref":"/vendor/avira/avira_antivirus_for_small_business"},{"vendor":"avira","product":"avira_exchange_security","name":"avira exchange security","label":"avira_exchange_security","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 8.3.54.138","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 8.3.54.138","eol":null,"hubHref":"/vendor/avira/avira_exchange_security"},{"vendor":"avira","product":"avira_free_security_suite","name":"avira free security suite","label":"avira_free_security_suite","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 8.3.54.138","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 8.3.54.138","eol":null,"hubHref":"/vendor/avira/avira_free_security_suite"},{"vendor":"avira","product":"avira_internet_security_suite","name":"avira internet security suite","label":"avira_internet_security_suite","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 8.3.54.138","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 8.3.54.138","eol":null,"hubHref":"/vendor/avira/avira_internet_security_suite"},{"vendor":"avira","product":"avira_prime","name":"avira prime","label":"avira_prime","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 8.3.54.138","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 8.3.54.138","eol":null,"hubHref":"/vendor/avira/avira_prime"}],"affectedCount":8,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://blog.zoller.lu/p/from-low-hanging-fruit-department-avira.html","label":"blog.zoller.lu/p/from-low-hanging-fruit-department-avira.html","hostname":"blog.zoller.lu","tags":["X Refsource MISC","Third Party Advisory"]},{"url":"https://www.zoller.lu/%5BTZO-01-2020%5D%20AVIRA%20Generic%20Bypass%20ISO.pdf","label":"www.zoller.lu/%5BTZO-01-2020%5D%20AVIRA%20Generic%20Bypass%20ISO.pdf","hostname":"www.zoller.lu","tags":["X Refsource MISC"]},{"url":"http://packetstormsecurity.com/files/156472/AVIRA-Generic-Malformed-Container-Bypass.html","label":"packetstormsecurity.com/files/156472/AVIRA-Generic-Malformed-Container-Bypass.html","hostname":"packetstormsecurity.com","tags":["X Refsource MISC","Third Party Advisory","VDB Entry"]},{"url":"http://seclists.org/fulldisclosure/2020/Feb/31","label":"seclists.org/fulldisclosure/2020/Feb/31","hostname":"seclists.org","tags":["Mailing List","X Refsource FULLDISC","Third Party Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2020-02-20T21:39:43.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-04T10:26:16.367Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":23,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T13:34:48.130Z","stale":false,"partial":false}}