{"id":"UBUNTU-CVE-2016-4423","details":"The attemptAuthentication function in Component/Security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php in Symfony before 2.3.41, 2.7.x before 2.7.13, 2.8.x before 2.8.6, and 3.0.x before 3.0.6 does not limit the length of a username stored in a session, which allows remote attackers to cause a denial of service (session storage consumption) via a series of authentication attempts with long, non-existent usernames.","modified":"2025-10-24T04:45:45Z","published":"2016-06-01T22:59:00Z","upstream":["CVE-2016-4423"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-4423"},{"type":"REPORT","url":"https://github.com/symfony/symfony/pull/18733"},{"type":"REPORT","url":"https://symfony.com/blog/cve-2016-4423-large-username-storage-in-session"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2016-4423"}],"affected":[{"package":{"name":"symfony","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/symfony@2.7.10-0ubuntu2?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.1+dfsg-1","2.7.5+dfsg-1","2.7.9+dfsg-1","2.7.9+dfsg-1ubuntu2","2.7.10-0ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"php-symfony-asset","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-browser-kit","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-class-loader","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-config","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-console","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-css-selector","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-debug","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-debug-bundle","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-dependency-injection","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-doctrine-bridge","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-dom-crawler","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-event-dispatcher","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-expression-language","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-filesystem","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-finder","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-form","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-framework-bundle","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-http-foundation","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-http-kernel","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-intl","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-locale","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-monolog-bridge","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-options-resolver","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-phpunit-bridge","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-process","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-property-access","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-proxy-manager-bridge","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-routing","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-security","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-security-bundle","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-serializer","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-stopwatch","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-swiftmailer-bridge","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-templating","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-translation","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-twig-bridge","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-twig-bundle","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-validator","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-var-dumper","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-web-profiler-bundle","binary_version":"2.7.10-0ubuntu2"},{"binary_name":"php-symfony-yaml","binary_version":"2.7.10-0ubuntu2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2016/UBUNTU-CVE-2016-4423.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}