{"id":"UBUNTU-CVE-2020-13935","details":"The payload length in a WebSocket frame was not correctly validated in Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M1 to 9.0.36, 8.5.0 to 8.5.56 and 7.0.27 to 7.0.104. Invalid payload lengths could trigger an infinite loop. Multiple requests with invalid payload lengths could lead to a denial of service.","modified":"2026-07-15T19:45:17.463664333Z","published":"2020-07-14T15:15:00Z","related":["USN-4448-1","USN-4596-1"],"upstream":["CVE-2020-13935"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-13935"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2020/07/14/3"},{"type":"REPORT","url":"https://lists.apache.org/thread.html/rd48c72bd3255bda87564d4da3791517c074d94f8a701f93b85752651%40%3Cannounce.tomcat.apache.org%3E"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4448-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4596-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-13935"}],"affected":[{"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_name":"libservlet3.0-java","binary_version":"7.0.52-1ubuntu0.16+esm2"},{"binary_version":"7.0.52-1ubuntu0.16+esm2","binary_name":"libtomcat7-java"},{"binary_version":"7.0.52-1ubuntu0.16+esm2","binary_name":"tomcat7"},{"binary_name":"tomcat7-admin","binary_version":"7.0.52-1ubuntu0.16+esm2"},{"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_name":"tomcat7-examples","binary_version":"7.0.52-1ubuntu0.16+esm2"},{"binary_version":"7.0.52-1ubuntu0.16+esm2","binary_name":"tomcat7-user"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-13935.json"}},{"package":{"name":"tomcat8","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/tomcat8?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.32-1ubuntu1.13"}]}],"versions":["8.0.26-1","8.0.28-1","8.0.30-1","8.0.32-1","8.0.32-1ubuntu1","8.0.32-1ubuntu1.1","8.0.32-1ubuntu1.2","8.0.32-1ubuntu1.3","8.0.32-1ubuntu1.4","8.0.32-1ubuntu1.5","8.0.32-1ubuntu1.6","8.0.32-1ubuntu1.7","8.0.32-1ubuntu1.8","8.0.32-1ubuntu1.9","8.0.32-1ubuntu1.10","8.0.32-1ubuntu1.11"],"ecosystem_specific":{"binaries":[{"binary_name":"libservlet3.1-java","binary_version":"8.0.32-1ubuntu1.13"},{"binary_name":"libtomcat8-java","binary_version":"8.0.32-1ubuntu1.13"},{"binary_version":"8.0.32-1ubuntu1.13","binary_name":"tomcat8"},{"binary_name":"tomcat8-admin","binary_version":"8.0.32-1ubuntu1.13"},{"binary_version":"8.0.32-1ubuntu1.13","binary_name":"tomcat8-common"},{"binary_version":"8.0.32-1ubuntu1.13","binary_name":"tomcat8-docs"},{"binary_version":"8.0.32-1ubuntu1.13","binary_name":"tomcat8-examples"},{"binary_name":"tomcat8-user","binary_version":"8.0.32-1ubuntu1.13"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-13935.json"}},{"package":{"name":"tomcat7","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/tomcat7?arch=source&distro=esm-apps-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.0.64-1","7.0.68-1","7.0.68-1ubuntu0.1","7.0.68-1ubuntu0.3","7.0.68-1ubuntu0.4","7.0.68-1ubuntu0.4+esm1","7.0.68-1ubuntu0.4+esm2","7.0.68-1ubuntu0.4+esm3","7.0.68-1ubuntu0.4+esm4"],"ecosystem_specific":{"binaries":[{"binary_name":"libservlet3.0-java","binary_version":"7.0.68-1ubuntu0.4+esm4"},{"binary_version":"7.0.68-1ubuntu0.4+esm4","binary_name":"libtomcat7-java"},{"binary_name":"tomcat7","binary_version":"7.0.68-1ubuntu0.4+esm4"},{"binary_name":"tomcat7-admin","binary_version":"7.0.68-1ubuntu0.4+esm4"},{"binary_name":"tomcat7-common","binary_version":"7.0.68-1ubuntu0.4+esm4"},{"binary_version":"7.0.68-1ubuntu0.4+esm4","binary_name":"tomcat7-docs"},{"binary_name":"tomcat7-examples","binary_version":"7.0.68-1ubuntu0.4+esm4"},{"binary_name":"tomcat7-user","binary_version":"7.0.68-1ubuntu0.4+esm4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-13935.json"}},{"package":{"name":"tomcat8","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/tomcat8?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.5.21-1ubuntu1","8.5.29-1","8.5.30-1","8.5.30-1ubuntu1","8.5.30-1ubuntu1.2","8.5.30-1ubuntu1.3","8.5.30-1ubuntu1.4","8.5.39-1ubuntu1~18.04.1","8.5.39-1ubuntu1~18.04.2","8.5.39-1ubuntu1~18.04.3","8.5.39-1ubuntu1~18.04.3+esm1","8.5.39-1ubuntu1~18.04.3+esm2","8.5.39-1ubuntu1~18.04.3+esm3","8.5.39-1ubuntu1~18.04.3+esm4","8.5.39-1ubuntu1~18.04.3+esm5","8.5.39-1ubuntu1~18.04.3+esm6"],"ecosystem_specific":{"binaries":[{"binary_version":"8.5.39-1ubuntu1~18.04.3+esm6","binary_name":"libtomcat8-embed-java"},{"binary_name":"libtomcat8-java","binary_version":"8.5.39-1ubuntu1~18.04.3+esm6"},{"binary_name":"tomcat8","binary_version":"8.5.39-1ubuntu1~18.04.3+esm6"},{"binary_name":"tomcat8-admin","binary_version":"8.5.39-1ubuntu1~18.04.3+esm6"},{"binary_name":"tomcat8-common","binary_version":"8.5.39-1ubuntu1~18.04.3+esm6"},{"binary_name":"tomcat8-docs","binary_version":"8.5.39-1ubuntu1~18.04.3+esm6"},{"binary_name":"tomcat8-examples","binary_version":"8.5.39-1ubuntu1~18.04.3+esm6"},{"binary_name":"tomcat8-user","binary_version":"8.5.39-1ubuntu1~18.04.3+esm6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-13935.json"}},{"package":{"name":"tomcat9","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/tomcat9?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.0.16-3~18.04.1","9.0.16-3ubuntu0.18.04.1","9.0.16-3ubuntu0.18.04.2","9.0.16-3ubuntu0.18.04.2+esm1","9.0.16-3ubuntu0.18.04.2+esm2","9.0.16-3ubuntu0.18.04.2+esm3","9.0.16-3ubuntu0.18.04.2+esm4","9.0.16-3ubuntu0.18.04.2+esm5","9.0.16-3ubuntu0.18.04.2+esm6","9.0.16-3ubuntu0.18.04.2+esm7","9.0.16-3ubuntu0.18.04.2+esm8"],"ecosystem_specific":{"binaries":[{"binary_version":"9.0.16-3ubuntu0.18.04.2+esm8","binary_name":"libtomcat9-embed-java"},{"binary_version":"9.0.16-3ubuntu0.18.04.2+esm8","binary_name":"libtomcat9-java"},{"binary_name":"tomcat9","binary_version":"9.0.16-3ubuntu0.18.04.2+esm8"},{"binary_version":"9.0.16-3ubuntu0.18.04.2+esm8","binary_name":"tomcat9-admin"},{"binary_name":"tomcat9-common","binary_version":"9.0.16-3ubuntu0.18.04.2+esm8"},{"binary_name":"tomcat9-docs","binary_version":"9.0.16-3ubuntu0.18.04.2+esm8"},{"binary_name":"tomcat9-examples","binary_version":"9.0.16-3ubuntu0.18.04.2+esm8"},{"binary_name":"tomcat9-user","binary_version":"9.0.16-3ubuntu0.18.04.2+esm8"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-13935.json"}},{"package":{"name":"tomcat9","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/tomcat9?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.0.31-1ubuntu0.1"}]}],"versions":["9.0.24-1","9.0.27-1","9.0.31-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libtomcat9-embed-java","binary_version":"9.0.31-1ubuntu0.1"},{"binary_version":"9.0.31-1ubuntu0.1","binary_name":"libtomcat9-java"},{"binary_name":"tomcat9","binary_version":"9.0.31-1ubuntu0.1"},{"binary_name":"tomcat9-admin","binary_version":"9.0.31-1ubuntu0.1"},{"binary_name":"tomcat9-common","binary_version":"9.0.31-1ubuntu0.1"},{"binary_name":"tomcat9-docs","binary_version":"9.0.31-1ubuntu0.1"},{"binary_version":"9.0.31-1ubuntu0.1","binary_name":"tomcat9-examples"},{"binary_name":"tomcat9-user","binary_version":"9.0.31-1ubuntu0.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-13935.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:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}