{"schemaVersion":3,"id":"CVE-2021-3849","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"An authentication bypass vulnerability was discovered in the web interface of the Lenovo Fan Power Controller2 (FPC2) and Lenovo System Management Module (SMM) firmware that could allow an unauthenticated attacker to execute commands on the SMM and FPC2. SMM2 is not affected.","dates":{"published":"2022-04-22T21:10:11.000Z","modified":"2024-08-03T17:09:09.602Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.8,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":7.5,"severity":"high","vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01303,"percentile":0.70097,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.01303},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01303,"percentile":0.70097}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01303,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01303,"percentile":0.70097}]},"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-288","name":"Authentication Bypass Using an Alternate Path or Channel","description":"The product requires authentication, but the product has an alternate path or channel that does not require authentication.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/288.html"}],"affected":[{"vendor":"ibm","product":"nextscale_fan_power_controller_firmware","name":"nextscale fan power controller firmware","label":"nextscale_fan_power_controller_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 44a-3.70","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 44a-3.70","eol":null,"hubHref":"/vendor/ibm/nextscale_fan_power_controller"},{"vendor":"lenovo","product":"fan power controller2 (fpc2)","name":"Fan Power Controller2 (FPC2)","label":"fan power controller2 (fpc2)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"various","noFixRecorded":false,"fixedIn":null}],"versionsText":"various","eol":null,"hubHref":"/vendor/lenovo/fan_power_controller2_fpc2"},{"vendor":"lenovo","product":"lenovo system management module (smm)","name":"Lenovo System Management Module (SMM)","label":"lenovo system management module (smm)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"various","noFixRecorded":false,"fixedIn":null}],"versionsText":"various","eol":null,"hubHref":"/vendor/lenovo/lenovo_system_management_module_smm"},{"vendor":"lenovo","product":"nextscale_n1200_enclosure_firmware","name":"nextscale n1200 enclosure firmware","label":"nextscale_n1200_enclosure_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< fhet50b-2.90","noFixRecorded":false,"fixedIn":null}],"versionsText":"< fhet50b-2.90","eol":null,"hubHref":"/vendor/lenovo/nextscale_n1200_enclosure"},{"vendor":"lenovo","product":"thinkagile_hx_enclosure_certified_node_firmware","name":"thinkagile hx enclosure certified node firmware","label":"thinkagile_hx_enclosure_certified_node_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< tesm28b-1.21","noFixRecorded":false,"fixedIn":null}],"versionsText":"< tesm28b-1.21","eol":null,"hubHref":"/vendor/lenovo/thinkagile_hx_enclosure_certified_node"},{"vendor":"lenovo","product":"thinkagile_vx_enclosure_firmware","name":"thinkagile vx enclosure firmware","label":"thinkagile_vx_enclosure_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< tesm28b-1.21","noFixRecorded":false,"fixedIn":null}],"versionsText":"< tesm28b-1.21","eol":null,"hubHref":"/vendor/lenovo/thinkagile_vx_enclosure"},{"vendor":"lenovo","product":"thinksystem_d2_enclosure_firmware","name":"thinksystem d2 enclosure firmware","label":"thinksystem_d2_enclosure_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< tesm28b-1.21","noFixRecorded":false,"fixedIn":null}],"versionsText":"< tesm28b-1.21","eol":null,"hubHref":"/vendor/lenovo/thinksystem_d2_enclosure"}],"affectedCount":7,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://support.lenovo.com/us/en/product_security/LEN-72615","label":"support.lenovo.com/us/en/product_security/LEN-72615","hostname":"support.lenovo.com","tags":["X Refsource MISC","Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2022-04-22T21:10:11.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-03T17:09:09.602Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T10:05:16.099Z","stale":false,"partial":false}}