CVE-2021-23463

XML External Entity (XXE) Injection

8.1 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: None
Availability: High

Exploit likelihood

2.79%Up 1.7 points since Dec 11, 2021

What each source reports

CVE List Score used 8.1

XML External Entity (XXE) Injection

Record: CVE-2021-23463
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H/E:P
Updated: 2026-11-02

EUVDEUVD-2021-2477 8.1

Record: EUVD-2021-2477
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H/E:P
Updated: 2026-11-03

GitHub AdvisoriesGHSA-7rpj-hg47-cx62 8.1

Improper Restriction of XML External Entity Reference in com.h2database:h2.

H2 is an embeddable RDBMS written in Java. 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.

Record: GHSA-7rpj-hg47-cx62
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Weakness: CWE-611
Updated: 2026-11-02

NVD 8.1

Record: CVE-2021-23463
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CVSS 2.0: 6.4 MediumAV:N/AC:L/Au:N/C:P/I:N/A:P
Weakness: CWE-611
Updated: 2026-11-02

OSV 9.1

Record: CVE-2021-23463
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Updated: 2026-11-02

OSVGHSA-7rpj-hg47-cx62 8.1

Improper Restriction of XML External Entity Reference in com.h2database:h2.

Record: GHSA-7rpj-hg47-cx62
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Weakness: CWE-611
Updated: 2026-11-02

OSVCLSA-2025-1763597218 No score

TuxCare security update for com.h2database:h2 (4 CVEs)

TuxCare rebuilt com.h2database:h2 to address 4 CVEs. Fixed in 1.4.200-tuxcare.1.

Record: CLSA-2025-1763597218
Updated: 2026-11-02

Affected products

h2database h2

Affected packages

Affected packages
Package	Affected	Fixed
`com.h2database:h2` Maven	1.4.198 up to 2.0.202	2.0.202
`com.h2database:h2` TuxCare:Maven From an advisory covering 4 CVEs	1.4.200 up to 1.4.200-tuxcare.1	1.4.200-tuxcare.1
`com.h2database:h2` Maven	1.4.198 up to 2.0.202, plus listed versions 1.4.1991.4.200	2.0.202

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-23463 is a high vulnerability (CVSS 8.1) in H2database H2, published December 10, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.79%, the 86th percentile. Fixed in com.h2database:h2 2.0.202.

References

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