{"id":"UBUNTU-CVE-2021-30640","details":"A vulnerability in the JNDI Realm of Apache Tomcat allows an attacker to authenticate using variations of a valid user name and/or to bypass some of the protection provided by the LockOut Realm. This issue affects Apache Tomcat 10.0.0-M1 to 10.0.5; 9.0.0.M1 to 9.0.45; 8.5.0 to 8.5.65.","modified":"2026-07-15T19:45:12.906270344Z","published":"2021-07-12T15:15:00Z","related":["USN-5360-1"],"upstream":["CVE-2021-30640"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-30640"},{"type":"REPORT","url":"https://bz.apache.org/bugzilla/show_bug.cgi?id=65224"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/c4df8d44a959a937d507d15e5b1ca35c3dbc41eb"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/749f3cc192c68c34f2375509aea087be45fc4434"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/c6b6e1015ae44c936971b6bf8bce70987935b92e"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/91ecdc61ce3420054c04114baaaf1c1e0cbd5d56"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/e50067486cf86564175ca0cfdcbf7d209c6df862"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/b5585a9e5d4fec020cc5ebadb82f899fae22bc43"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/329932012d3a9b95fde0b18618416e659ecffdc0"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/3ce84512ed8783577d9945df28da5a033465b945"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/24dfb30076997b640e5123e92c4b8d7f206f609c"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/0a272b00aed57526dbfc8b881ab253c23c61f100"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/c9f21a2a7908c7c4ecd4f9bb495d3ee36a2bd822"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/4e86b4ea0d1a9b00fa93971c31b93ad1bd49c7fe"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/79580e7f70a07c083be07307376511bb864d5a7b"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/d3407672774e372fae8b5898d55f85d16f22b972"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/6a9129ac9bd06555ce04bb564a76fc3987311f38"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/ad22db641dcd61c2e8078f658fa709897b5da375"},{"type":"REPORT","url":"https://lists.apache.org/thread.html/r59f9ef03929d32120f91f4ea7e6e79edd5688d75d0a9b65fd26d1fe8%40%3Cannounce.tomcat.apache.org%3E"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5360-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-30640"}],"affected":[{"package":{"name":"tomcat6","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/tomcat6?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.0.37-1","6.0.39-1","6.0.39-1ubuntu0.1","6.0.39-1ubuntu0.1+esm1","6.0.39-1ubuntu0.1+esm2","6.0.39-1ubuntu0.1+esm3"],"ecosystem_specific":{"binaries":[{"binary_version":"6.0.39-1ubuntu0.1+esm3","binary_name":"libservlet2.4-java"},{"binary_name":"libservlet2.5-java","binary_version":"6.0.39-1ubuntu0.1+esm3"},{"binary_name":"libtomcat6-java","binary_version":"6.0.39-1ubuntu0.1+esm3"},{"binary_version":"6.0.39-1ubuntu0.1+esm3","binary_name":"tomcat6"},{"binary_name":"tomcat6-admin","binary_version":"6.0.39-1ubuntu0.1+esm3"},{"binary_version":"6.0.39-1ubuntu0.1+esm3","binary_name":"tomcat6-common"},{"binary_name":"tomcat6-docs","binary_version":"6.0.39-1ubuntu0.1+esm3"},{"binary_name":"tomcat6-examples","binary_version":"6.0.39-1ubuntu0.1+esm3"},{"binary_version":"6.0.39-1ubuntu0.1+esm3","binary_name":"tomcat6-extras"},{"binary_version":"6.0.39-1ubuntu0.1+esm3","binary_name":"tomcat6-user"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-30640.json"}},{"package":{"name":"tomcat7","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/tomcat7?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.0.42-1","7.0.47-1","7.0.50-1","7.0.52-1","7.0.52-1ubuntu0.1","7.0.52-1ubuntu0.3","7.0.52-1ubuntu0.6","7.0.52-1ubuntu0.7","7.0.52-1ubuntu0.8","7.0.52-1ubuntu0.9","7.0.52-1ubuntu0.10","7.0.52-1ubuntu0.11","7.0.52-1ubuntu0.13","7.0.52-1ubuntu0.14","7.0.52-1ubuntu0.15","7.0.52-1ubuntu0.16","7.0.52-1ubuntu0.16+esm1","7.0.52-1ubuntu0.16+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"7.0.52-1ubuntu0.16+esm2","binary_name":"libservlet3.0-java"},{"binary_name":"libtomcat7-java","binary_version":"7.0.52-1ubuntu0.16+esm2"},{"binary_version":"7.0.52-1ubuntu0.16+esm2","binary_name":"tomcat7"},{"binary_version":"7.0.52-1ubuntu0.16+esm2","binary_name":"tomcat7-admin"},{"binary_name":"tomcat7-common","binary_version":"7.0.52-1ubuntu0.16+esm2"},{"binary_name":"tomcat7-docs","binary_version":"7.0.52-1ubuntu0.16+esm2"},{"binary_version":"7.0.52-1ubuntu0.16+esm2","binary_name":"tomcat7-examples"},{"binary_name":"tomcat7-user","binary_version":"7.0.52-1ubuntu0.16+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-30640.json"}},{"package":{"name":"tomcat8","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pk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