{"id":"UBUNTU-CVE-2021-21344","details":"XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker to load and execute arbitrary code from a remote host only by manipulating the processed input stream. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.","modified":"2026-01-30T00:55:15.971708Z","published":"2021-03-23T00:15:00Z","related":["USN-4943-1","USN-6978-1"],"upstream":["CVE-2021-21344"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-21344"},{"type":"REPORT","url":"https://github.com/x-stream/xstream/security/advisories/GHSA-59jw-jqf4-3wq3"},{"type":"REPORT","url":"http://x-stream.github.io/changes.html#1.4.16"},{"type":"REPORT","url":"https://x-stream.github.io/CVE-2021-21344.html"},{"type":"REPORT","url":"https://x-stream.github.io/security.html#workaround"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4943-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-21344"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6978-1"}],"affected":[{"package":{"name":"libxstream-java","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/libxstream-java@1.4.7-1ubuntu0.1+esm2?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.7-1ubuntu0.1+esm2"}]}],"versions":["1.4.4-1","1.4.7-1","1.4.7-1ubuntu0.1","1.4.7-1ubuntu0.1+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"libxstream-java","binary_version":"1.4.7-1ubuntu0.1+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-21344.json"}},{"package":{"name":"libxstream-java","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libxstream-java@1.4.8-1ubuntu0.1+esm3?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.8-1ubuntu0.1+esm3"}]}],"versions":["1.4.8-1","1.4.8-1ubuntu0.1","1.4.8-1ubuntu0.1+esm1","1.4.8-1ubuntu0.1+esm2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"libxstream-java","binary_version":"1.4.8-1ubuntu0.1+esm3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-21344.json"}},{"package":{"name":"libxstream-java","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libxstream-java@1.4.11.1-1~18.04.2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.11.1-1~18.04.2"}]}],"versions":["1.4.10-1","1.4.11.1-1~18.04","1.4.11.1-1~18.04.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1.4.11.1-1~18.04.2","binary_name":"libxstream-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-21344.json"}},{"package":{"name":"libxstream-java","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libxstream-java@1.4.11.1-1ubuntu0.2?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.11.1-1ubuntu0.2"}]}],"versions":["1.4.11.1-1","1.4.11.1-1ubuntu0.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libxstream-java","binary_version":"1.4.11.1-1ubuntu0.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-21344.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}