HOMEVULNERABILITIESCVE-2021-23463
CRITICAL

CVE-2021-23463

CWE-611Published: December 10, 2021· Updated: Jun 17, 2026

9.1
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-23463 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), availability disruption (denial of service), with a CVSS base score of 9.1.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected Vendors & Products

h2database1 product(s)
h2
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/h2database/h2database/issues/3195
PATCHhttps://github.com/h2database/h2database/pull/3199
PATCHhttps://snyk.io/vuln/SNYK-JAVA-COMH2DATABASE-1769238
PATCHhttps://github.com/h2database/h2database/issues/3195
PATCHhttps://github.com/h2database/h2database/pull/3199
PATCHhttps://snyk.io/vuln/SNYK-JAVA-COMH2DATABASE-1769238

All References (12)

→
https://github.com/h2database/h2database/commit/d83285fd2e48fb075780ee95badee6f5a15ea7f8%23diff-008c2e4462609982199cd83e7cf6f1d6b41296b516783f6752c44b9f15dc7bc3Broken Link
→
https://github.com/h2database/h2database/issues/3195Exploit · Issue Tracking · Patch · Third Party Advisory
→
https://github.com/h2database/h2database/pull/3199Issue Tracking · Patch · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20230818-0010/
→
https://snyk.io/vuln/SNYK-JAVA-COMH2DATABASE-1769238Exploit · Patch · Third Party Advisory
→
https://www.oracle.com/security-alerts/cpuapr2022.htmlNot Applicable
→
https://github.com/h2database/h2database/commit/d83285fd2e48fb075780ee95badee6f5a15ea7f8%23diff-008c2e4462609982199cd83e7cf6f1d6b41296b516783f6752c44b9f15dc7bc3Broken Link
→
https://github.com/h2database/h2database/issues/3195Exploit · Issue Tracking · Patch · Third Party Advisory
→
https://github.com/h2database/h2database/pull/3199Issue Tracking · Patch · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20230818-0010/
→
https://snyk.io/vuln/SNYK-JAVA-COMH2DATABASE-1769238Exploit · Patch · Third Party Advisory
→
https://www.oracle.com/security-alerts/cpuapr2022.htmlNot Applicable

Quick Facts

CVE IDCVE-2021-23463
CVSS Score9.1 / 10
SeverityCRITICAL
WeaknessCWE-611
CISA KEVNo
Affected1 vendor(s)
PublishedDec 10, 2021

Related CVEs (CWE-611)

CVE-2015-9280
10.0
CVE-2018-1000825
10.0
CVE-2018-1000823
10.0
CVE-2018-1000821
10.0
CVE-2018-1000820
10.0
CVE-2018-1000822
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-23463 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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