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CVE-2021-23463

31
FAUCET Score

CVE-2021-23463 is an XML External Entity (XXE) Injection vulnerability affecting the H2 database, specifically versions 1.4.198 up to, but not including, 2.0.202. This critical vulnerability (CVSS 9.1) allows an unauthenticated attacker to remotely inject malicious XML, potentially leading to information disclosure or denial of service. While no public exploits, Metasploit modules, or Nuclei templates are currently available, and there's minimal community discussion or media coverage, the high CVSS score indicates a significant risk if exploited.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.4.198, < 2.0.202CPE matchmatch criteria
cpe:2.3:a:h2database:h2:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.28%
Probability of exploitation in next 30 days
EPSS Percentile
87.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0328 is in the 79th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

github_advisorypatch availablevia nvd_reference
View patch
mavenpatch availablevia ghsa
Product: com.h2database:h2Fixed in: 2.0.202
redhatno patchvia redhat_api
Product: Red Hat build of Apicurio Registry 2Fixed in: com.h2database.h2
redhatno patchvia redhat_api
Product: Red Hat build of QuarkusFixed in: com.h2database.h2

Vendor Advisories (2)

mavenGHSA-7rpj-hg47-cx62high

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

Dec 16, 2021
redhatCVE-2021-23463Important

h2database: XXE injection vulnerability

Oct 22, 2021

References

github.com / h2database/h2database/commit/d83285fd2e48fb075780ee95badee6f5a15ea7f8%23diff-008c2e4462609982199cd83e7cf6f1d6b41296b516783f6752c44b9f15dc7bc3
Broken Link
github.com / h2database/h2database/issues/3195
ExploitIssue TrackingPatchThird Party Advisory
github.com / h2database/h2database/pull/3199
Issue TrackingPatchThird Party Advisory
security.netapp.com / advisory/ntap-20230818-0010
snyk.io / vuln/SNYK-JAVA-COMH2DATABASE-1769238
ExploitPatchThird Party Advisory
oracle.com / security-alerts/cpuapr2022.html
Not Applicable