{"id":"CVE-2020-5849","published":"2020-03-16T18:15:12Z","modified":"2026-06-17T03:22:19Z","title":"Unraid Authentication Bypass Vulnerability","vendor":"Unraid","product":"Unraid","tier":"core","eol":null,"description":{"text":"Unraid 6.8.0 allows authentication bypass.","provenance":"source","from":"NVD"},"summary":{"text":"The flaw is an authentication bypass in Unraid 6.8.0, the product's authentication handling. An attacker with network access can bypass authentication without any credentials or user interaction, gaining access they should not have, under the default configuration.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:10:55Z"},"cvss":{"score":7.5,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","provenance":"source","from":"NVD"},"epss":{"score":0.93243,"percentile":0.99834,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2021-11-03","dueDate":"2022-05-03","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2020-5849","provenance":"source"},"vulncheckKev":{"dateAdded":"2021-11-03","exploitedFirstSeen":"2021-11-03","ransomware":false,"evidence":[{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2021-11-03"}],"evidenceTotal":1,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-697","name":"Incorrect Comparison"},{"id":"CWE-287","name":"Improper Authentication"}],"references":[{"url":"http://packetstormsecurity.com/files/157275/Unraid-6.8.0-Authentication-Bypass-Arbitrary-Code-Execution.html","tags":["Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://forums.unraid.net/forum/7-announcements/","tags":["Release Notes","Vendor Advisory"]},{"url":"https://sysdream.com/news/lab/","tags":["Third Party Advisory"]},{"url":"https://sysdream.com/news/lab/2020-02-06-cve-2020-5847-cve-2020-5849-unraid-6-8-0-unauthenticated-remote-code-execution-as-root/","tags":["Broken Link","Exploit","Third Party Advisory"]},{"url":"http://packetstormsecurity.com/files/157275/Unraid-6.8.0-Authentication-Bypass-Arbitrary-Code-Execution.html","tags":["Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://forums.unraid.net/forum/7-announcements/","tags":["Release Notes","Vendor Advisory"]},{"url":"https://sysdream.com/news/lab/","tags":["Third Party Advisory"]},{"url":"https://sysdream.com/news/lab/2020-02-06-cve-2020-5847-cve-2020-5849-unraid-6-8-0-unauthenticated-remote-code-execution-as-root/","tags":["Broken Link","Exploit","Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-5849","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Authentication bypass via exposed service endpoint","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"Unraid 6.8.0 allows authentication bypass","start":0,"end":41}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1078","name":"Valid Accounts","tactics":["initial-access","persistence","privilege-escalation","stealth"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Bypass yields valid-looking authenticated access","mappingType":"primary_impact","evidence":[{"from":"description","quote":"Unraid 6.8.0 allows authentication bypass","start":0,"end":41}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2020-27003","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-27003","exploited":true,"exploitedSince":"2021-11-03","provenance":"source"},"exploits":[{"id":48353,"url":"https://www.exploit-db.com/exploits/48353","title":"Unraid 6.8.0 - Auth Bypass PHP Code Execution (Metasploit)","type":"remote","platform":"linux","date":"2020-04-20","verified":true,"provenance":"source"}],"exploitSources":{"exploitdb":{"count":1,"earliest":"2020-04-20"},"metasploit":[{"name":"Unraid 6.8.0 Auth Bypass PHP Code Execution","module":"exploit/linux/http/unraid_auth_bypass_exec","type":"exploit","disclosureDate":"2020-02-10","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/http/unraid_auth_bypass_exec.rb"}],"first":{"date":"2020-02-10","source":"Metasploit","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/http/unraid_auth_bypass_exec.rb"},"provenance":"source"},"exploitRefs":["http://packetstormsecurity.com/files/157275/Unraid-6.8.0-Authentication-Bypass-Arbitrary-Code-Execution.html","https://sysdream.com/news/lab/2020-02-06-cve-2020-5847-cve-2020-5849-unraid-6-8-0-unauthenticated-remote-code-execution-as-root/"],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"ai"},{"stage":"primary","techniques":["T1078"],"provenance":"ai"}],"timeline":[{"date":"2020-02-10","kind":"exploit-public","label":"First public exploit: Metasploit; later: Exploit-DB 2020-04-20","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/http/unraid_auth_bypass_exec.rb","provenance":"source"},{"date":"2020-03-16","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5849","provenance":"source"},{"date":"2021-11-03","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","provenance":"source"},{"date":"2021-11-03","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2021-11-03","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-27003","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":"Metasploit","daysToKev":597},"priority":{"score":68.2,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 1821 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.97,"detail":"percentile 0.9983"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"2 NVD references tagged Exploit; 1 Exploit-DB entry; 1 Metasploit module"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":5.25,"detail":"base score 7.5"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}