{"id":"CVE-2013-4073","url":"https://www.cyber-defence.io/tools/cve/CVE-2013-4073","generatedAt":"2026-10-28T04:15:55.443Z","title":"The OpenSSL::SSL.verify_certificate_identity function in lib/openssl/ssl.rb in Ruby 1.8 before 1.8.7-p374, 1.9 before 1.9.3-p448, and 2.0 before 2.0.0-p247 does not properly handle a '\\0' character in a domain name in the Subject Alternative Name field…","description":"The OpenSSL::SSL.verify_certificate_identity function in lib/openssl/ssl.rb in Ruby 1.8 before 1.8.7-p374, 1.9 before 1.9.3-p448, and 2.0 before 2.0.0-p247 does not properly handle a '\\0' character in a domain name in the Subject Alternative Name field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.","published":"2013-08-18T02:52:23.000Z","lastModified":"2026-06-16T23:56:34.000Z","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-310"],"affected":["ruby-lang/ruby"],"epss":{"score":0.02757,"percentile":0.86174,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (2.76%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"http://forums.interworx.com/threads/8000-InterWorx-Version-5-0-14-Released-on-Beta-Channel%21","source":"cve@mitre.org"},{"url":"http://lists.apple.com/archives/security-announce/2013/Oct/msg00004.html","source":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-updates/2013-07/msg00042.html","source":"cve@mitre.org"},{"url":"http://lists.opensuse.org/opensuse-updates/2013-07/msg00044.html","source":"cve@mitre.org"},{"url":"http://rhn.redhat.com/errata/RHSA-2013-1090.html","source":"cve@mitre.org"},{"url":"http://rhn.redhat.com/errata/RHSA-2013-1103.html","source":"cve@mitre.org"},{"url":"http://rhn.redhat.com/errata/RHSA-2013-1137.html","source":"cve@mitre.org"},{"url":"http://support.apple.com/kb/HT6150","source":"cve@mitre.org"},{"url":"http://www.debian.org/security/2013/dsa-2738","source":"cve@mitre.org"},{"url":"http://www.debian.org/security/2013/dsa-2809","source":"cve@mitre.org"},{"url":"http://www.ruby-lang.org/en/news/2013/06/27/hostname-check-bypassing-vulnerability-in-openssl-client-cve-2013-4073/","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://www.ubuntu.com/usn/USN-1902-1","source":"cve@mitre.org"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=979251","source":"cve@mitre.org"},{"url":"https://puppet.com/security/cve/cve-2013-4073","source":"cve@mitre.org"},{"url":"http://forums.interworx.com/threads/8000-InterWorx-Version-5-0-14-Released-on-Beta-Channel%21","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://lists.apple.com/archives/security-announce/2013/Oct/msg00004.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://lists.opensuse.org/opensuse-updates/2013-07/msg00042.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://lists.opensuse.org/opensuse-updates/2013-07/msg00044.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://rhn.redhat.com/errata/RHSA-2013-1090.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://rhn.redhat.com/errata/RHSA-2013-1103.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://rhn.redhat.com/errata/RHSA-2013-1137.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://support.apple.com/kb/HT6150","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.debian.org/security/2013/dsa-2738","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.debian.org/security/2013/dsa-2809","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.ruby-lang.org/en/news/2013/06/27/hostname-check-bypassing-vulnerability-in-openssl-client-cve-2013-4073/","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.ubuntu.com/usn/USN-1902-1","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=979251","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://puppet.com/security/cve/cve-2013-4073","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2013-4073","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."}