What is the CVSS score of CVE-2024-6863?

CVE-2024-6863 has a CVSS 3.0 base score of 6.5 (Medium). CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L. EPSS exploitation probability: 0.1%.

Which versions of H2O are affected by CVE-2024-6863?

Organizations using h2oai/h2o-3 should be aware of notable risk from CVE-2024-6863 rated CVSS 6.5. Exploitation could compromise the security of affected deployments.

Is there a public PoC exploit available for CVE-2024-6863?

Yes, a public proof-of-concept exploit is available for CVE-2024-6863. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2024-6863?

Within 7 days: Identify affected systems running h2oai/h2o-3 and apply vendor patches promptly. Monitor vendor channels for patch availability.

H2O CVE-2024-6863

MEDIUM

Exposed Dangerous Method or Function (CWE-749)

2025-03-20 security@huntr.dev

Information Disclosure H2O

6.5

CVSS 3.0 · NVD

Severity by source

NVD PRIMARY

6.5 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

Low

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:32 vuln.today

PoC Detected

Jul 15, 2025 - 15:52 vuln.today

Public exploit code

CVE Published

Mar 20, 2025 - 10:15 nvd

MEDIUM 6.5

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

27 maven packages depend on ai.h2o:h2o-core (21 direct, 6 indirect)

Ecosystem-wide dependent count for version 3.32.1.2.

DescriptionCVE.org

In h2oai/h2o-3 version 3.46.0, an endpoint exposing a custom EncryptionTool allows an attacker to encrypt any files on the target server with a key of their choosing. The chosen key can also be overwritten, resulting in ransomware-like behavior. This vulnerability makes it possible for an attacker to encrypt arbitrary files with keys of their choice, making it exceedingly difficult for the target to recover the keys needed for decryption.

AnalysisAI

In h2oai/h2o-3 version 3.46.0, an endpoint exposing a custom EncryptionTool allows an attacker to encrypt any files on the target server with a key of their choosing. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-749. In h2oai/h2o-3 version 3.46.0, an endpoint exposing a custom EncryptionTool allows an attacker to encrypt any files on the target server with a key of their choosing. The chosen key can also be overwritten, resulting in ransomware-like behavior. This vulnerability makes it possible for an attacker to encrypt arbitrary files with keys of their choice, making it exceedingly difficult for the target to recover the keys needed for decryption. Affected products include: H2O. Version information: version 3.46.0.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.