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    CVE-2023-30847

    H2O is an HTTP server. In versions 2.3.0-beta2 and prior, when the reverse proxy handler tries to processes a certain type of invalid HTTP request, it tries to build an upstream URL by reading from uninitialized pointer. This behavior can lead to crashes or leak of information to back end HTTP servers. Pull request number 3229 fixes the issue. The pull request has been merged to the `master` branch in commit f010336. Users should upgrade to commit f010336 or later.

    Published:Apr 27, 2023
    Last Modified:Jan 30, 2025
    EPS:Apr 27, 2023
    EPSS Score:0.00261
    CVSS Score:8.2

    Affected Products

    Vendor
    Dena
    Product
    H2o

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-824 Access of Uninitialized Pointer

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2024-25622 (CVSS 3.1) — h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The configuration directives provided by t…
    CVE-2023-50247 (CVSS 3.7) — h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. The QUIC stack (quicly), as used by H2O up…
    CVE-2023-41337 (CVSS 6.1) — h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. In version 2.3.0-beta2 and prior, when h2o…
    CVE-2023-44487 (CVSS 7.5) — The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can …
    CVE-2021-43848 (CVSS 7.4) — h2o is an open source http server. In code prior to the `8c0eca3` commit h2o may attempt to access uninitializ…
    CVE-2018-0608 (CVSS 9.8) — Buffer overflow in H2O version 2.2.4 and earlier allows remote attackers to execute arbitrary code or cause a …
    CVE-2017-10872 (CVSS 6.5) — H2O version 2.2.3 and earlier allows remote attackers to cause a denial of service in the server via unspecifi…
    CVE-2017-10869 (CVSS 7.5) — Buffer overflow in H2O version 2.2.2 and earlier allows remote attackers to cause a denial-of-service in the s…

    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