CVE-2024-6863Public exploitNetwork attack vector

Arbitrary file encryption via exposed EncryptionTool endpoint

Published Mar 20, 2025 · Updated Oct 15, 2025

Exposed EncryptionTool endpoint in H2O.ai H2O-3 3.46.0 allows remote attackers to encrypt arbitrary server files with chosen keys. EncryptionTool.main accepts caller-supplied keystore, cipher, input, and output paths, then opens the output and copies encrypted input bytes into it without restricting either path. The REST interface is open by default; no privileges or user interaction are required, and replacing the chosen key can make encrypted data unrecoverable.

CVSS severity6.5
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Exposed EncryptionTool endpoint in H2O.ai H2O-3 3.46.0 allows remote attackers to encrypt arbitrary server files with chosen keys. EncryptionTool.main accepts caller-supplied keystore, cipher, input, and output paths, then opens the output and copies encrypted input bytes into it without restricting either path. The REST interface is open by default; no privileges or user interaction are required, and replacing the chosen key can make encrypted data unrecoverable.

The record

CVE
CVE-2024-6863
Published
Mar 20, 2025
Updated
Oct 15, 2025
Vendor
H2O.ai
Product
H2O-3
Classifications
CWE-749, T1486
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=unspecified <=latest

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

H2O.ai · H2O-3version=unspecified <=latest

Published CVSS scores

6.5huntr.devCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-749Exposed Dangerous Method or Function
T1486Data Encrypted for Impact

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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