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    CVE-2024-6863

    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.

    Published:Mar 20, 2025
    Last Modified:Oct 15, 2025
    EPS:Mar 20, 2025
    EPSS Score:0.00052
    CVSS Score:6.5

    Affected Products

    Vendor
    H2o
    Product
    H2o

    Exploits

    https://huntr.com/bounties/10f55937-0cba-4530-897f-2abf30ed5270

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-500 WebView Injection

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High