{"id":"CVE-2018-17153","url":"https://www.cyber-defence.io/tools/cve/CVE-2018-17153","generatedAt":"2026-10-28T19:02:26.397Z","title":"It was discovered that the Western Digital My Cloud device before 2.30.196 is affected by an authentication bypass vulnerability.","description":"It was discovered that the Western Digital My Cloud device before 2.30.196 is affected by an authentication bypass vulnerability. An unauthenticated attacker can exploit this vulnerability to authenticate as an admin user without needing to provide a password, thereby gaining full control of the device. (Whenever an admin logs into My Cloud, a server-side session is created that is bound to the user's IP address. After the session is created, it is possible to call authenticated CGI modules by sending the cookie username=admin in the HTTP request. The invoked CGI will check if a valid session is present and bound to the user's IP address.) It was found that it is possible for an unauthenticated attacker to create a valid session without a login. The network_mgr.cgi CGI module contains a command called \"cgi_get_ipv6\" that starts an admin session -- tied to the IP address of the user making the request -- if the additional parameter \"flag\" with the value \"1\" is provided. Subsequent invocation of commands that would normally require admin privileges now succeed if an attacker sets the username=admin cookie.","published":"2018-09-18T15:29:00.000Z","lastModified":"2026-06-17T01:45:26.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.0","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-287"],"affected":["western digital/my cloud wdbctl0020hwt firmware","western digital/my cloud pr4100","western digital/my cloud pr2100 firmware","western digital/my cloud mirror gen 2 firmware","western digital/my cloud mirror firmware","western digital/my cloud ex4100","western digital/my cloud ex4 firmware","western digital/my cloud ex2100 firmware","western digital/my cloud ex2 ultra firmware","western digital/my cloud ex2 firmware","western digital/my cloud dl4100 firmware","western digital/my cloud dl2100"],"epss":{"score":0.86586,"percentile":0.99737,"date":"2026-10-27","history":[{"date":"2026-09-21","score":0.77422,"percentile":0.99549},{"date":"2026-09-22","score":0.86586,"percentile":0.9973}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 86.6%, higher than 100% of all known CVEs. Patch or mitigate before the next change window."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-09-22T00:00:00.000Z","detail":{"to":0.86586,"from":0.77422,"percentile":0.9973},"summary":"EPSS moved from 77.4% to 86.6% probability of exploitation in the next thirty days."}],"references":[{"url":"http://packetstormsecurity.com/files/173802/Western-Digital-MyCloud-Unauthenticated-Command-Injection.html","source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/bid/105359","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"https://securify.nl/nl/advisory/SFY20180102/authentication-bypass-vulnerability-in-western-digital-my-cloud-allows-escalation-to-admin-privileges.html","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://support.wdc.com/knowledgebase/answer.aspx?ID=25952","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://packetstormsecurity.com/files/173802/Western-Digital-MyCloud-Unauthenticated-Command-Injection.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/105359","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://securify.nl/nl/advisory/SFY20180102/authentication-bypass-vulnerability-in-western-digital-my-cloud-allows-escalation-to-admin-privileges.html","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://support.wdc.com/knowledgebase/answer.aspx?ID=25952","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-17153","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}