{"id":"UBUNTU-CVE-2020-17527","details":"While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.","modified":"2026-07-15T19:45:11.516661780Z","published":"2020-12-03T19:15:00Z","related":["USN-5360-1"],"upstream":["CVE-2020-17527"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-17527"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/d56293f816d6dc9e2b47107f208fa9e95db58c65"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/21e3408671aac7e0d7e264e720cac8b1b189eb29"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2020/12/03/3"},{"type":"REPORT","url":"https://lists.apache.org/thread.html/r8a227ac6a755a6406c1cc47dd48800e973d4cf13fe7fe68ac59c679c@%3Cdev.tomcat.apache.org%3E"},{"type":"REPORT","url":"https://lists.apache.org/thread.html/raa0e9ad388c1e6fd1e301b5e080f9439f64cb4178119a86a4801cc53@%3Cdev.tomcat.apache.org%3E"},{"type":"REPORT","url":"https://lists.apache.org/thread.html/rce5ac9a40173651d540babce59f6f3825f12c6d4e886ba00823b11e5%40%3Cannounce.tomcat.apache.org%3E"},{"type":"REPORT","url":"https://lists.apache.org/thread.html/rce5ac9a40173651d540babce59f6f3825f12c6d4e886ba00823b11e5@%3Cannounce.apache.org%3E"},{"type":"REPORT","url":"https://lists.apache.org/thread.html/rce5ac9a40173651d540babce59f6f3825f12c6d4e886ba00823b11e5@%3Cannounce.tomcat.apache.org%3E"},{"type":"REPORT","url":"https://lists.apache.org/thread.html/rd5babd13d7a350b369b2f647b4dd32ce678af42f9aba5389df1ae6ca@%3Cusers.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-2020-17527"}],"affected":[{"package":{"name":"tomcat9","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/tomcat9?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.0.16-3ubuntu0.18.04.2"}]}],"versions":["9.0.16-3~18.04.1","9.0.16-3ubuntu0.18.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libtomcat9-embed-java","binary_version":"9.0.16-3ubuntu0.18.04.2"},{"binary_name":"libtomcat9-java","binary_version":"9.0.16-3ubuntu0.18.04.2"},{"binary_version":"9.0.16-3ubuntu0.18.04.2","binary_name":"tomcat9"},{"binary_name":"tomcat9-admin","binary_version":"9.0.16-3ubuntu0.18.04.2"},{"binary_name":"tomcat9-common","binary_version":"9.0.16-3ubuntu0.18.04.2"},{"binary_name":"tomcat9-docs","binary_version":"9.0.16-3ubuntu0.18.04.2"},{"binary_version":"9.0.16-3ubuntu0.18.04.2","binary_name":"tomcat9-examples"},{"binary_version":"9.0.16-3ubuntu0.18.04.2","binary_name":"tomcat9-user"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-17527.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_name":"libtomcat8-embed-java","binary_version":"8.5.39-1ubuntu1~18.04.3+esm6"},{"binary_name":"libtomcat8-java","binary_version":"8.5.39-1ubuntu1~18.04.3+esm6"},{"binary_version":"8.5.39-1ubuntu1~18.04.3+esm6","binary_name":"tomcat8"},{"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-2020-17527.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":"9.0.31-1ubuntu0.2"}]}],"versions":["9.0.24-1","9.0.27-1","9.0.31-1","9.0.31-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libtomcat9-embed-java","binary_version":"9.0.31-1ubuntu0.2"},{"binary_name":"libtomcat9-java","binary_version":"9.0.31-1ubuntu0.2"},{"binary_version":"9.0.31-1ubuntu0.2","binary_name":"tomcat9"},{"binary_name":"tomcat9-admin","binary_version":"9.0.31-1ubuntu0.2"},{"binary_name":"tomcat9-common","binary_version":"9.0.31-1ubuntu0.2"},{"binary_version":"9.0.31-1ubuntu0.2","binary_name":"tomcat9-docs"},{"binary_version":"9.0.31-1ubuntu0.2","binary_name":"tomcat9-examples"},{"binary_name":"tomcat9-user","binary_version":"9.0.31-1ubuntu0.2"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-17527.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:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}