{"id":"CVE-2021-21350","aliases":["BIT-activemq-2021-21350","GHSA-43gc-mjxg-gvrq"],"url":"https://o3.security/vulnerability/CVE-2021-21350","summary":"XStream is vulnerable to an Arbitrary Code Execution attack","details":"### Impact\nThe vulnerability may allow a remote attacker to execute arbitrary code 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.\n\n### Patches\nIf you rely on XStream's default blacklist of the [Security Framework](https://x-stream.github.io/security.html#framework), you will have to use at least version 1.4.16.\n\n### Workarounds\nSee [workarounds](https://x-stream.github.io/security.html#workaround) for the different versions covering all CVEs.\n\n### References\nSee full information about the nature of the vulnerability and the steps to reproduce it in XStream's documentation for [CVE-2021-21350](https://x-stream.github.io/CVE-2021-21350.html).\n\n### Credits\nThe vulnerability was discovered and reported by threedr3am.\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [XStream](https://github.com/x-stream/xstream/issues)\n* Contact us at [XStream Google Group](https://groups.google.com/group/xstream-user)","published":"2021-03-23T00:15:13.273Z","modified":"2026-10-09T02:30:47.525672268Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Maven","name":"com.thoughtworks.xstream:xstream","fixedVersion":"1.4.16"}],"fix":null,"references":[{"type":"ADVISORY","url":"http://x-stream.github.io/changes.html#1.4.16"},{"type":"ADVISORY","url":"https://github.com/x-stream/xstream/security/advisories/GHSA-43gc-mjxg-gvrq"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2021/04/msg00002.html"},{"type":"ADVISORY","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/22KVR6B5IZP3BGQ3HPWIO2FWWCKT3DHP/"},{"type":"ADVISORY","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PVPHZA7VW2RRSDCOIPP2W6O5ND254TU7/"},{"type":"ADVISORY","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGXIU3YDPG6OGTDHMBLAFN7BPBERXREB/"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20210430-0002/"},{"type":"ADVISORY","url":"https://www.debian.org/security/2021/dsa-5004"},{"type":"ADVISORY","url":"https://www.oracle.com//security-alerts/cpujul2021.html"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpuoct2021.html"},{"type":"ADVISORY","url":"https://x-stream.github.io/security.html#workaround"},{"type":"REPORT","url":"https://lists.apache.org/thread.html/r8244fd0831db894d5e89911ded9c72196d395a90ae655414d23ed0dd%40%3Cusers.activemq.apache.org%3E"},{"type":"REPORT","url":"https://lists.apache.org/thread.html/r9ac71b047767205aa22e3a08cb33f3e0586de6b2fac48b425c6e16b0%40%3Cdev.jmeter.apache.org%3E"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"type":"EVIDENCE","url":"https://x-stream.github.io/CVE-2021-21350.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21350"},{"type":"PACKAGE","url":"https://github.com/x-stream/xstream"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r8244fd0831db894d5e89911ded9c72196d395a90ae655414d23ed0dd@%3Cusers.activemq.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r9ac71b047767205aa22e3a08cb33f3e0586de6b2fac48b425c6e16b0@%3Cdev.jmeter.apache.org%3E"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/22KVR6B5IZP3BGQ3HPWIO2FWWCKT3DHP"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PVPHZA7VW2RRSDCOIPP2W6O5ND254TU7"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QGXIU3YDPG6OGTDHMBLAFN7BPBERXREB"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20210430-0002"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-09T02:30:47.525672268Z"}}