{"id":"CVE-2011-1720","url":"https://www.cyber-defence.io/tools/cve/CVE-2011-1720","generatedAt":"2026-10-27T23:20:08.276Z","title":"The SMTP server in Postfix before 2.5.13, 2.6.x before 2.6.10, 2.7.x before 2.7.4, and 2.8.x before 2.8.3, when certain Cyrus SASL authentication methods are enabled, does not create a new server handle after client authentication fails, which allows…","description":"The SMTP server in Postfix before 2.5.13, 2.6.x before 2.6.10, 2.7.x before 2.7.4, and 2.8.x before 2.8.3, when certain Cyrus SASL authentication methods are enabled, does not create a new server handle after client authentication fails, which allows remote attackers to cause a denial of service (heap memory corruption and daemon crash) or possibly execute arbitrary code via an invalid AUTH command with one method followed by an AUTH command with a different method.","published":"2011-05-13T17:05:43.000Z","lastModified":"2026-06-16T23:29:54.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"2.0","score":6.8,"severity":"MEDIUM","vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P"},"cwe":["CWE-119"],"affected":["postfix/postfix"],"epss":{"score":0.21481,"percentile":0.97598,"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":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 21.5%, higher than 98% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705","source":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2011-05/msg00002.html","source":"cve@mitre.org"},{"url":"http://secunia.com/advisories/44500","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://security.gentoo.org/glsa/glsa-201206-33.xml","source":"cve@mitre.org"},{"url":"http://securityreason.com/securityalert/8247","source":"cve@mitre.org"},{"url":"http://www.debian.org/security/2011/dsa-2233","source":"cve@mitre.org"},{"url":"http://www.kb.cert.org/vuls/id/727230","tags":["US Government Resource"],"source":"cve@mitre.org"},{"url":"http://www.mail-archive.com/postfix-announce%40postfix.org/msg00007.html","source":"cve@mitre.org"},{"url":"http://www.mandriva.com/security/advisories?name=MDVSA-2011:090","source":"cve@mitre.org"},{"url":"http://www.osvdb.org/72259","source":"cve@mitre.org"},{"url":"http://www.postfix.org/CVE-2011-1720.html","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://www.postfix.org/announcements/postfix-2.8.3.html","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/archive/1/517917/100/0/threaded","source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/bid/47778","tags":["Patch"],"source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id?1025521","source":"cve@mitre.org"},{"url":"http://www.ubuntu.com/usn/usn-1131-1","source":"cve@mitre.org"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=699035","source":"cve@mitre.org"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/67359","source":"cve@mitre.org"},{"url":"http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://lists.opensuse.org/opensuse-security-announce/2011-05/msg00002.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://secunia.com/advisories/44500","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://security.gentoo.org/glsa/glsa-201206-33.xml","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://securityreason.com/securityalert/8247","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.debian.org/security/2011/dsa-2233","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.kb.cert.org/vuls/id/727230","tags":["US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.mail-archive.com/postfix-announce%40postfix.org/msg00007.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.mandriva.com/security/advisories?name=MDVSA-2011:090","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.osvdb.org/72259","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.postfix.org/CVE-2011-1720.html","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.postfix.org/announcements/postfix-2.8.3.html","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/archive/1/517917/100/0/threaded","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/47778","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id?1025521","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.ubuntu.com/usn/usn-1131-1","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=699035","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/67359","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2011-1720","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."}