CriticalFix available

libxstream-java — security advisory

Type: advisorySources: OSVAdvisory ID: DEBIAN-CVE-2021-21351

XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a 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. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.

Products: libxstream-java
Affected versions: Not specified
Fixed versions: 1.4.15-2
CVEs: CVE-2021-21351
Confirmed fixed CVEs: Not specified
Updated in this feed: 1 Nov 2026, 00:32 UTC · Revision 1

Source evidence

DEBIAN-CVE-2021-21351

core-osv · Original source

Published 23 Mar 2021, 00:15 UTC

osv:DEBIAN-CVE-2021-21351

libxstream-java

Fixed versions: 1.4.15-2

libxstream-java

Fixed versions: 1.4.15-2

libxstream-java

Fixed versions: 1.4.15-2

Complete source record

{
  "id": "bf5c9cbaa827c77552ac39dafc987a5ff47465c78f3cd4e47189175c00f09926",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2021-21351",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2021-21351",
    "summary": "XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a 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. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.",
    "evidence": "osv:DEBIAN-CVE-2021-21351",
    "products": [
      {
        "name": {
          "value": "libxstream-java",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.4.15-2",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libxstream-java",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.4.15-2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libxstream-java",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.4.15-2",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "DEBIAN-CVE-2021-21351",
      "aliases": [
        "DEBIAN-CVE-2021-21351"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
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              ]
            }
          ],
          "package": {
            "name": "libxstream-java",
            "purl": "pkg:deb/debian/libxstream-java?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-21351.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.4.15-2"
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              ]
            }
          ],
          "package": {
            "name": "libxstream-java",
            "purl": "pkg:deb/debian/libxstream-java?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-21351.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
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        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
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              ]
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          ],
          "package": {
            "name": "libxstream-java",
            "purl": "pkg:deb/debian/libxstream-java?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-21351.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-23T18:03:24.901991603Z",
      "provider": "osv",
      "upstream": [
        "CVE-2021-21351"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2021-21351"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2021-21351",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 421429,
  "published_at": "2021-03-23T00:15:13.367+00:00"
}