{"id":"UBUNTU-CVE-2021-21707","details":"In PHP versions 7.3.x below 7.3.33, 7.4.x below 7.4.26 and 8.0.x below 8.0.13, certain XML parsing functions, like simplexml_load_file(), URL-decode the filename passed to them. If that filename contains URL-encoded NUL character, this may cause the function to interpret this as the end of the filename, thus interpreting the filename differently from what the user intended, which may lead it to reading a different file than intended.","modified":"2026-04-22T12:46:01.138357Z","published":"2021-11-29T07:15:00Z","related":["USN-5300-1","USN-5300-2","USN-5300-3"],"upstream":["CVE-2021-21707"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-21707"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5300-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5300-2"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5300-3"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-21707"}],"affected":[{"package":{"name":"php5","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/php5@5.5.9+dfsg-1ubuntu4.29+esm16?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.5.3+dfsg-1ubuntu2","5.5.3+dfsg-1ubuntu3","5.5.6+dfsg-1ubuntu1","5.5.6+dfsg-1ubuntu2","5.5.8+dfsg-2ubuntu1","5.5.9+dfsg-1ubuntu1","5.5.9+dfsg-1ubuntu2","5.5.9+dfsg-1ubuntu3","5.5.9+dfsg-1ubuntu4","5.5.9+dfsg-1ubuntu4.1","5.5.9+dfsg-1ubuntu4.2","5.5.9+dfsg-1ubuntu4.3","5.5.9+dfsg-1ubuntu4.4","5.5.9+dfsg-1ubuntu4.5","5.5.9+dfsg-1ubuntu4.6","5.5.9+dfsg-1ubuntu4.7","5.5.9+dfsg-1ubuntu4.9","5.5.9+dfsg-1ubuntu4.11","5.5.9+dfsg-1ubuntu4.12","5.5.9+dfsg-1ubuntu4.13","5.5.9+dfsg-1ubuntu4.14","5.5.9+dfsg-1ubuntu4.16","5.5.9+dfsg-1ubuntu4.17","5.5.9+dfsg-1ubuntu4.19","5.5.9+dfsg-1ubuntu4.20","5.5.9+dfsg-1ubuntu4.21","5.5.9+dfsg-1ubuntu4.22","5.5.9+dfsg-1ubuntu4.23","5.5.9+dfsg-1ubuntu4.24","5.5.9+dfsg-1ubuntu4.25","5.5.9+dfsg-1ubuntu4.26","5.5.9+dfsg-1ubuntu4.27","5.5.9+dfsg-1ubuntu4.29","5.5.9+dfsg-1ubuntu4.29+esm1","5.5.9+dfsg-1ubuntu4.29+esm2","5.5.9+dfsg-1ubuntu4.29+esm3","5.5.9+dfsg-1ubuntu4.29+esm4","5.5.9+dfsg-1ubuntu4.29+esm5","5.5.9+dfsg-1ubuntu4.29+esm6","5.5.9+dfsg-1ubuntu4.29+esm8","5.5.9+dfsg-1ubuntu4.29+esm10","5.5.9+dfsg-1ubuntu4.29+esm11","5.5.9+dfsg-1ubuntu4.29+esm12","5.5.9+dfsg-1ubuntu4.29+esm13","5.5.9+dfsg-1ubuntu4.29+esm14","5.5.9+dfsg-1ubuntu4.29+esm15","5.5.9+dfsg-1ubuntu4.29+esm16"],"ecosystem_specific":{"binaries":[{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"libapache2-mod-php5"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"libapache2-mod-php5filter"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"libphp5-embed"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php-pear"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-cgi"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-cli"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-common"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-curl"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-enchant"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-fpm"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-gd"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-gmp"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-intl"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-ldap"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-mysql"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-mysqlnd"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-odbc"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-pgsql"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-pspell"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-readline"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-recode"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-snmp"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-sqlite"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-sybase"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-tidy"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-xmlrpc"},{"binary_version":"5.5.9+dfsg-1ubuntu4.29+esm16","binary_name":"php5-xsl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-21707.json"}},{"package":{"name":"php7.0","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/php7.0@7.0.33-0ubuntu0.16.04.16+esm3?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.0.33-0ubuntu0.16.04.16+esm3"}]}],"versions":["7.0.1-5","7.0.1-6","7.0.2-1","7.0.2-3","7.0.2-4","7.0.2-5","7.0.3-2","7.0.3-3","7.0.3-9ubuntu1","7.0.4-5ubuntu1","7.0.4-5ubuntu2","7.0.4-7ubuntu1","7.0.4-7ubuntu2","7.0.4-7ubuntu2.1","7.0.8-0ubuntu0.16.04.1","7.0.8-0ubuntu0.16.04.2","7.0.8-0ubuntu0.16.04.3","7.0.13-0ubuntu0.16.04.1","7.0.15-0ubuntu0.16.04.1","7.0.15-0ubuntu0.16.04.2","7.0.15-0ubuntu0.16.04.4","7.0.18-0ubuntu0.16.04.1","7.0.22-0ubuntu0.16.04.1","7.0.25-0ubuntu0.16.04.1","7.0.28-0ubuntu0.16.04.1","7.0.30-0ubuntu0.16.04.1","7.0.32-0ubuntu0.16.04.1","7.0.33-0ubuntu0.16.04.1","7.0.33-0ubuntu0.16.04.2","7.0.33-0ubuntu0.16.04.3","7.0.33-0ubuntu0.16.04.4","7.0.33-0ubuntu0.16.04.5","7.0.33-0ubuntu0.16.04.6","7.0.33-0ubuntu0.16.04.7","7.0.33-0ubuntu0.16.04.9","7.0.33-0ubuntu0.16.04.11","7.0.33-0ubuntu0.16.04.12","7.0.33-0ubuntu0.16.04.14","7.0.33-0ubuntu0.16.04.15","7.0.33-0ubuntu0.16.04.16","7.0.33-0ubuntu0.16.04.16+esm1","7.0.33-0ubuntu0.16.04.16+esm2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"libapache2-mod-php7.0"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"libphp7.0-embed"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-bcmath"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-bz2"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-cgi"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-cli"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-common"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-curl"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-dba"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-enchant"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-fpm"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-gd"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-gmp"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-imap"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-interbase"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-intl"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-json"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-ldap"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-mbstring"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-mcrypt"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-mysql"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-odbc"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-opcache"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-pgsql"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-phpdbg"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-pspell"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-readline"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-recode"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-snmp"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-soap"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-sqlite3"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-sybase"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-tidy"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-xml"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-xmlrpc"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-xsl"},{"binary_version":"7.0.33-0ubuntu0.16.04.16+esm3","binary_name":"php7.0-zip"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-21707.json"}},{"package":{"name":"php7.2","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/php7.2@7.2.24-0ubuntu0.18.04.11?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.2.24-0ubuntu0.18.04.11"}]}],"versions":["7.2.1-1ubuntu2","7.2.2-1ubuntu1","7.2.2-1ubuntu2","7.2.3-1ubuntu1","7.2.5-0ubuntu0.18.04.1","7.2.7-0ubuntu0.18.04.1","7.2.7-0ubuntu0.18.04.2","7.2.10-0ubuntu0.18.04.1","7.2.15-0ubuntu0.18.04.1","7.2.15-0ubuntu0.18.04.2","7.2.17-0ubuntu0.18.04.1","7.2.19-0ubuntu0.18.04.1","7.2.19-0ubuntu0.18.04.2","7.2.24-0ubuntu0.18.04.1","7.2.24-0ubuntu0.18.04.2","7.2.24-0ubuntu0.18.04.3","7.2.24-0ubuntu0.18.04.4","7.2.24-0ubuntu0.18.04.6","7.2.24-0ubuntu0.18.04.7","7.2.24-0ubuntu0.18.04.8","7.2.24-0ubuntu0.18.04.9","7.2.24-0ubuntu0.18.04.10"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"libapache2-mod-php7.2"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"libphp7.2-embed"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-bcmath"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-bz2"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-cgi"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-cli"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-common"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-curl"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-dba"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-enchant"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-fpm"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-gd"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-gmp"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-imap"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-interbase"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-intl"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-json"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-ldap"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-mbstring"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-mysql"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-odbc"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-opcache"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-pgsql"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-phpdbg"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-pspell"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-readline"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-recode"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-snmp"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-soap"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-sqlite3"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-sybase"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-tidy"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-xml"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-xmlrpc"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-xsl"},{"binary_version":"7.2.24-0ubuntu0.18.04.11","binary_name":"php7.2-zip"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-21707.json"}},{"package":{"name":"php7.4","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/php7.4@7.4.3-4ubuntu2.10?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.4.3-4ubuntu2.10"}]}],"versions":["7.4.3-4build1","7.4.3-4build2","7.4.3-4ubuntu1","7.4.3-4ubuntu1.1","7.4.3-4ubuntu2.2","7.4.3-4ubuntu2.4","7.4.3-4ubuntu2.5","7.4.3-4ubuntu2.6","7.4.3-4ubuntu2.7","7.4.3-4ubuntu2.8","7.4.3-4ubuntu2.9"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"libapache2-mod-php7.4"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"libphp7.4-embed"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-bcmath"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-bz2"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-cgi"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-cli"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-common"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-curl"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-dba"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-enchant"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-fpm"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-gd"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-gmp"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-imap"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-interbase"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-intl"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-json"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-ldap"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-mbstring"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-mysql"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-odbc"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-opcache"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-pgsql"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-phpdbg"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-pspell"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-readline"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-snmp"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-soap"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-sqlite3"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-sybase"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-tidy"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-xml"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-xmlrpc"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-xsl"},{"binary_version":"7.4.3-4ubuntu2.10","binary_name":"php7.4-zip"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-21707.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"type":"Ubuntu","score":"low"}]}