{"api_version":"1","generated_at":"2026-07-23T08:55:13+00:00","cve":"CVE-2009-4128","urls":{"html":"https://cve.report/CVE-2009-4128","api":"https://cve.report/api/cve/CVE-2009-4128.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2009-4128","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2009-4128"},"summary":{"title":"CVE-2009-4128","description":"GNU GRand Unified Bootloader (GRUB) 2 1.97 only compares the submitted portion of a password with the actual password, which makes it easier for physically proximate attackers to conduct brute force attacks and bypass authentication by submitting a password whose length is 1.","state":"PUBLISHED","assigner":"mitre","published_at":"2009-12-01 16:30:01","updated_at":"2026-04-23 00:35:47"},"problem_types":["CWE-287","n/a"],"metrics":[{"version":"2.0","source":"nvd@nist.gov","type":"Primary","score":"7.2","severity":"","vector":"AV:L/AC:L/Au:N/C:C/I:C/A:C","data":{"version":"2.0","vectorString":"AV:L/AC:L/Au:N/C:C/I:C/A:C","baseScore":7.2,"accessVector":"LOCAL","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"COMPLETE","integrityImpact":"COMPLETE","availabilityImpact":"COMPLETE"}}],"references":[{"url":"http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=555195","name":"http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=555195","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Exploit"],"title":"#555195 - grub2: password checking oddity - Debian Bug report logs","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"http://www.securityfocus.com/bid/36968","name":"http://www.securityfocus.com/bid/36968","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch"],"title":"GNU GRUB Local Authentication Bypass Vulnerability","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"http://www.openwall.com/lists/oss-security/2024/01/15/3","name":"http://www.openwall.com/lists/oss-security/2024/01/15/3","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"oss-security - CVE-2023-4001: a password bypass vulnerability in the downstream GRUB\n boot manager","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/54210","name":"https://exchange.xforce.ibmcloud.com/vulnerabilities/54210","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"IBM X-Force Exchange","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2009-4128","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2009-4128","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"n/a","product":"n/a","version":"affected n/a","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2009","cve_id":"4128","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"gnu","cpe5":"grub_2","cpe6":"1.97","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"providerMetadata":{"dateUpdated":"2024-08-07T06:54:09.498Z","orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE"},"references":[{"tags":["x_transferred"],"url":"http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=555195"},{"name":"36968","tags":["vdb-entry","x_transferred"],"url":"http://www.securityfocus.com/bid/36968"},{"name":"gnugrub2-password-auth-bypass(54210)","tags":["vdb-entry","x_transferred"],"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/54210"},{"name":"[oss-security] 20240116 CVE-2023-4001: a password bypass vulnerability in the downstream GRUB boot manager","tags":["mailing-list","x_transferred"],"url":"http://www.openwall.com/lists/oss-security/2024/01/15/3"}],"title":"CVE Program Container"}],"cna":{"affected":[{"product":"n/a","vendor":"n/a","versions":[{"status":"affected","version":"n/a"}]}],"datePublic":"2009-11-09T00:00:00.000Z","descriptions":[{"lang":"en","value":"GNU GRand Unified Bootloader (GRUB) 2 1.97 only compares the submitted portion of a password with the actual password, which makes it easier for physically proximate attackers to conduct brute force attacks and bypass authentication by submitting a password whose length is 1."}],"problemTypes":[{"descriptions":[{"description":"n/a","lang":"en","type":"text"}]}],"providerMetadata":{"dateUpdated":"2024-01-16T00:06:22.366Z","orgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","shortName":"mitre"},"references":[{"url":"http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=555195"},{"name":"36968","tags":["vdb-entry"],"url":"http://www.securityfocus.com/bid/36968"},{"name":"gnugrub2-password-auth-bypass(54210)","tags":["vdb-entry"],"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/54210"},{"name":"[oss-security] 20240116 CVE-2023-4001: a password bypass vulnerability in the downstream GRUB boot manager","tags":["mailing-list"],"url":"http://www.openwall.com/lists/oss-security/2024/01/15/3"}]}},"cveMetadata":{"assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","assignerShortName":"mitre","cveId":"CVE-2009-4128","datePublished":"2009-12-01T00:00:00.000Z","dateReserved":"2009-11-30T00:00:00.000Z","dateUpdated":"2024-08-07T06:54:09.498Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.1"},"nvd":{"publishedDate":"2009-12-01 16:30:01","lastModifiedDate":"2026-04-23 00:35:47","problem_types":["CWE-287","n/a"],"metrics":{"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:L/AC:L/Au:N/C:C/I:C/A:C","baseScore":7.2,"accessVector":"LOCAL","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"COMPLETE","integrityImpact":"COMPLETE","availabilityImpact":"COMPLETE"},"baseSeverity":"HIGH","exploitabilityScore":3.9,"impactScore":10,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:gnu:grub_2:1.97:*:*:*:*:*:*:*","matchCriteriaId":"955C28B6-5161-429A-92B3-996A3B799E68"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2009","CveId":"4128","Ordinal":"1","Title":"CVE-2009-4128","CVE":"CVE-2009-4128","Year":"2009"},"notes":[{"CveYear":"2009","CveId":"4128","Ordinal":"1","NoteData":"GNU GRand Unified Bootloader (GRUB) 2 1.97 only compares the submitted portion of a password with the actual password, which makes it easier for physically proximate attackers to conduct brute force attacks and bypass authentication by submitting a password whose length is 1.","Type":"Description","Title":"CVE-2009-4128"},{"CveYear":"2009","CveId":"4128","Ordinal":"2","NoteData":"2009-12-01","Type":"Other","Title":"Published"},{"CveYear":"2009","CveId":"4128","Ordinal":"3","NoteData":"2017-08-16","Type":"Other","Title":"Modified"}]}}}