{"id":"CVE-2021-39147","revision":null,"records":[{"revision":"a6a1c3bd68624610bac54b21215f629f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2021-39147","aliases":[],"title":"XStream is vulnerable to an Arbitrary Code Execution attack","description":"XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability 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. XStream 1.4.18 uses no longer a blacklist by default, since it cannot be secured for general purpose.","state":0,"publishedAt":"2021-08-23T18:05:33+00:00","modifiedAt":"2026-10-07T19:59:22.755+00:00","affected":[{"ecosystem":"Vendor product","name":"xstream","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"xstream\",\n                    \"vendor\": \"x-stream\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"< 1.4.18\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.5,"severity":"HIGH"}],"references":["https://github.com/x-stream/xstream/security/advisories/GHSA-h7v4-7xg3-hxcc","https://x-stream.github.io/CVE-2021-39147.html","https://lists.debian.org/debian-lts-announce/2021/09/msg00017.html","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/22KVR6B5IZP3BGQ3HPWIO2FWWCKT3DHP/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGXIU3YDPG6OGTDHMBLAFN7BPBERXREB/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PVPHZA7VW2RRSDCOIPP2W6O5ND254TU7/","https://www.debian.org/security/2021/dsa-5004","https://www.oracle.com/security-alerts/cpujan2022.html","https://security.netapp.com/advisory/ntap-20210923-0003/","https://www.oracle.com/security-alerts/cpuapr2022.html","https://www.oracle.com/security-alerts/cpujul2022.html"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2021-39147","license":"CVE Program Terms of Use","key":"cve-program:CVE-2021-39147","identifiers":["CVE-2021-39147"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-11T10:57:37.6316309+00:00","complete":true,"records":1779,"lastAttemptAt":"2026-11-11T10:57:37.6316309+00:00","lastSuccessAt":"2026-11-11T10:57:37.7940559+00:00","error":null,"lastVerifiedAt":"2026-11-11T10:57:37.7940585+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-de3b77103708811b6494d2ff7c979037d73ae579742cd1649a5c765137ae5083-b61703aa7a8a8776341875d56ae04881d75cb51c03ebed7341566c1aac4b78f3","complete":true,"records":424026,"lastAttemptAt":"2026-11-11T10:57:30.8429465+00:00","lastSuccessAt":"2026-11-11T10:57:30.772003+00:00","error":null,"lastVerifiedAt":"2026-11-11T10:57:30.8429465+00:00","snapshotPublishedAt":"2026-11-11T10:28:18+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-51fe477371604915b3d68ded9f0b35a4","complete":false,"records":13758,"lastAttemptAt":"2026-11-11T11:09:21.2288374+00:00","lastSuccessAt":"2026-11-11T11:09:21.223+00:00","error":null,"lastVerifiedAt":"2026-11-11T11:09:21.223+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13518,"expectedIdentifiers":13812,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-11T10:57:37.6316309+00:00","complete":true,"records":1097,"lastAttemptAt":"2026-11-11T10:57:37.6316309+00:00","lastSuccessAt":"2026-11-11T10:57:37.7955954+00:00","error":null,"lastVerifiedAt":"2026-11-11T10:57:37.7955973+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-622dd4c770014d0cabbdd0941fabd46f","complete":true,"records":13752,"lastAttemptAt":"2026-11-11T10:57:38.8624284+00:00","lastSuccessAt":"2026-11-11T10:57:38.856+00:00","error":null,"lastVerifiedAt":"2026-11-11T10:57:38.856+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13812,"expectedIdentifiers":13812,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-3562b6c78fd1bd0f0b55daf66a0926ae24f65e462df7f6d928caad458fc696bf","complete":true,"records":9947,"lastAttemptAt":"2026-11-11T10:57:31.188043+00:00","lastSuccessAt":"2026-11-11T04:27:43.6877707+00:00","error":null,"lastVerifiedAt":"2026-11-11T10:57:31.188043+00:00","snapshotPublishedAt":"2026-11-11T03:32:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-456002455e0ab94bb92c95476d4e6d175c104cd594749982afd96c893728ecbc","complete":true,"records":2010,"lastAttemptAt":"2026-11-11T10:57:30.9764176+00:00","lastSuccessAt":"2026-11-11T02:36:58.1276999+00:00","error":null,"lastVerifiedAt":"2026-11-11T10:57:30.9764176+00:00","snapshotPublishedAt":"2026-11-11T01:17:51+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-b178858a6ba5f2e20262964fa29d9573839d1b8b735abe524cc7d061ebde5c37","complete":true,"records":3088,"lastAttemptAt":"2026-11-11T10:57:37.5961627+00:00","lastSuccessAt":"2026-11-11T10:57:37.4490966+00:00","error":null,"lastVerifiedAt":"2026-11-11T10:57:37.5961627+00:00","snapshotPublishedAt":"2026-11-11T10:48:28+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-085e065fc9050ae18408f7e722c39653aeb186872334d7b3ec1fcafb7ed43d25","complete":true,"records":231665,"lastAttemptAt":"2026-11-11T10:57:31.0815536+00:00","lastSuccessAt":"2026-11-11T08:27:45.2700102+00:00","error":null,"lastVerifiedAt":"2026-11-11T10:57:31.0815536+00:00","snapshotPublishedAt":"2026-11-11T07:32:59+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}