# XML External Entity (XXE) Injection in JDOM

Advisory record · `GHSA-2363-cqg2-863c`

- **Identifiers:** `GHSA-2363-cqg2-863c` · `BIT-solr-2021-33813` · `CVE-2021-33813`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** Yes: CVSS 7+ and EPSS
- **Weakness (CWE):** [CWE-611](https://cwe.mitre.org/data/definitions/611.html)
- **Tags:** [XML external entities (XXE)](https://agentprime.io/advisories/tag/xxe.md)
- **Published:** 27 Jul 2021
- **Updated:** 16 Sept 2025
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 27 Jul 2021, 19:02 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 7.5 (7.0 or more) and EPSS 0.19 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `org.jdom:jdom2` (Maven): affected `<2.0.6.1`; fixed in `2.0.6.1`
- `org.jdom:jdom` (Maven): affected `<=2.0.2`; no fixed version yet

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.19, the 97th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:10 UTC: First seen by agentprime
- 31 Oct 2026, 15:10 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-2363-cqg2-863c)

## Sources

- [GitHub Advisory Database: GHSA-2363-cqg2-863c](https://github.com/advisories/GHSA-2363-cqg2-863c)
- [OSV: GHSA-2363-cqg2-863c](https://osv.dev/vulnerability/GHSA-2363-cqg2-863c)
- <https://nvd.nist.gov/vuln/detail/CVE-2021-33813>
- <https://github.com/hunterhacker/jdom/issues/189>
- <https://github.com/hunterhacker/jdom/pull/188>
- <https://github.com/hunterhacker/jdom/commit/dd4f3c2fc7893edd914954c73eb577f925a7d361>
- <https://www.oracle.com/security-alerts/cpujul2022.html>
- <https://www.oracle.com/security-alerts/cpuapr2022.html>
- <https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EWFVYTHGILOQXUA7U3SPOERQXL7OPSZG>
- <https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AH46QHE5GIMT6BL6C3GDTOYF27JYILXM>
- <https://lists.debian.org/debian-lts-announce/2021/07/msg00012.html>
- <https://lists.debian.org/debian-lts-announce/2021/06/msg00026.html>
- <https://lists.apache.org/thread.html/rfb7a93e40ebeb1e0068cde0bf3834dcab46bb1ef06d6424db48ed9fd@%3Cdev.tika.apache.org%3E>
- <https://lists.apache.org/thread.html/rbc075a4ac85e7a8e47420b7383f16ffa0af3b792b8423584735f369f@%3Cissues.solr.apache.org%3E>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-2363-cqg2-863c>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-2363-cqg2-863c/>. Everything for agents: <https://agentprime.io/llms.txt>.