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CVE-2021-33813: XML External Entity (XXE) Injection in JDOM

July 27, 2021 (updated September 16, 2025)

An XXE issue in SAXBuilder in JDOM through 2.0.6 allows attackers to cause a denial of service via a crafted HTTP request. As a workaround, to avoid external entities being expanded, one can call builder.setExpandEntities(false) and they won’t be expanded.

References

  • alephsecurity.com/vulns/aleph-2021003
  • github.com/advisories/GHSA-2363-cqg2-863c
  • github.com/hunterhacker/jdom
  • github.com/hunterhacker/jdom/commit/dd4f3c2fc7893edd914954c73eb577f925a7d361
  • github.com/hunterhacker/jdom/issues/189
  • github.com/hunterhacker/jdom/pull/188
  • github.com/hunterhacker/jdom/releases
  • github.com/hunterhacker/jdom/releases/tag/JDOM-2.0.6.1
  • lists.apache.org/thread.html/r21c406c7ed88fe340db7dbae75e58355159e6c324037c7d5547bf40b@%3Cissues.solr.apache.org%3E
  • lists.apache.org/thread.html/r5674106135bb1a6ef57483f4c63a9c44bca85d0e2a8a05895a8f1d89@%3Cissues.solr.apache.org%3E
  • lists.apache.org/thread.html/r6db397ae7281ead825338200d1f62d2827585a70797cc9ac0c4bd23f@%3Cissues.solr.apache.org%3E
  • lists.apache.org/thread.html/r845e987b7cd8efe610284958e997b84583f5a98d3394adc09e3482fe@%3Cissues.solr.apache.org%3E
  • lists.apache.org/thread.html/r89b3800cfabb1e773e49425e5d4239c28a659839a2eca6af3431482e@%3Cissues.solr.apache.org%3E
  • lists.apache.org/thread.html/r9974f64723875052e02787b2a5eda689ac5247c71b827d455e5dc9a6@%3Cissues.solr.apache.org%3E
  • lists.apache.org/thread.html/rbc075a4ac85e7a8e47420b7383f16ffa0af3b792b8423584735f369f@%3Cissues.solr.apache.org%3E
  • lists.apache.org/thread.html/rfb7a93e40ebeb1e0068cde0bf3834dcab46bb1ef06d6424db48ed9fd@%3Cdev.tika.apache.org%3E
  • lists.debian.org/debian-lts-announce/2021/06/msg00026.html
  • lists.debian.org/debian-lts-announce/2021/07/msg00012.html
  • lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AH46QHE5GIMT6BL6C3GDTOYF27JYILXM
  • lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EWFVYTHGILOQXUA7U3SPOERQXL7OPSZG
  • nvd.nist.gov/vuln/detail/CVE-2021-33813
  • www.oracle.com/security-alerts/cpuapr2022.html
  • www.oracle.com/security-alerts/cpujul2022.html

Code Behaviors & Features

Detect and mitigate CVE-2021-33813 with GitLab Dependency Scanning

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Affected versions

All versions up to 2.0.2

Solution

Unfortunately, there is no solution available yet.

Impact 7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Learn more about CVSS

Weakness

  • CWE-611: Improper Restriction of XML External Entity Reference

Source file

maven/org.jdom/jdom/CVE-2021-33813.yml

Spotted a mistake? Edit the file on GitLab.

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