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CVE-2021-23463

CriticalPublished

XML External Entity (XXE) Injection

Published: Dec 10, 2021
Updated: Sep 17, 2024
Assigning CNA: snyk
Evidence observed: Aug 8, 2026

Primary CVSS

9.1/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

2.7%

Low · next 30 days

Percentile: 85.2%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

The package com.h2database:h2 from 1.4.198 and before 2.0.202 are vulnerable to XML External Entity (XXE) Injection via the org.h2.jdbc.JdbcSQLXML class object, when it receives parsed string data from org.h2.jdbc.JdbcResultSet.getSQLXML() method. If it executes the getSource() method when the parameter is DOMSource.class it will trigger the vulnerability.

Sources

jdbc-sqlxml-xxePoC
h2-jdbc(https://github.com/h2database/h2database/issues/3195) & mysql-jdbc(CVE-2021-2471) SQLXML XXE vulnerability reproduction.

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