{"id":"CVE-2011-4409","url":"https://www.cyber-defence.io/tools/cve/CVE-2011-4409","generatedAt":"2026-10-27T18:46:21.237Z","title":"The Ubuntu One Client for Ubuntu 10.04 LTS, 11.04, 11.10, and 12.04 LTS does not properly validate SSL certificates, which allows remote attackers to spoof a server and modify or read sensitive information via a man-in-the-middle (MITM) attack.","description":"The Ubuntu One Client for Ubuntu 10.04 LTS, 11.04, 11.10, and 12.04 LTS does not properly validate SSL certificates, which allows remote attackers to spoof a server and modify or read sensitive information via a man-in-the-middle (MITM) attack.","published":"2012-06-16T00:55:06.000Z","lastModified":"2026-06-16T23:34:53.000Z","status":"Modified","sourceIdentifier":"security@ubuntu.com","cvss":{"version":"2.0","score":7.5,"severity":"HIGH","vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P"},"cwe":["CWE-20"],"affected":["canonical/ubuntu linux"],"epss":{"score":0.01735,"percentile":0.77512,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (1.74%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://secunia.com/advisories/49442","tags":["Vendor Advisory"],"source":"security@ubuntu.com"},{"url":"http://ubuntu.com/usn/usn-1465-1","tags":["Vendor Advisory"],"source":"security@ubuntu.com"},{"url":"http://ubuntu.com/usn/usn-1465-2","tags":["Vendor Advisory"],"source":"security@ubuntu.com"},{"url":"http://ubuntu.com/usn/usn-1465-3","source":"security@ubuntu.com"},{"url":"http://www.osvdb.org/82748","source":"security@ubuntu.com"},{"url":"http://www.securityfocus.com/bid/53828","source":"security@ubuntu.com"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/76113","source":"security@ubuntu.com"},{"url":"http://secunia.com/advisories/49442","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://ubuntu.com/usn/usn-1465-1","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://ubuntu.com/usn/usn-1465-2","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://ubuntu.com/usn/usn-1465-3","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.osvdb.org/82748","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/53828","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/76113","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2011-4409","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."}