CVE-2021-43797

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    CVE-2021-43797

    Published: 9 Dec 2021Last Modified: 27 Aug 2026

    Summary:

    Details: Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. Netty prior to version 4.1.71.Final skips control chars when they are present at the beginning / end of the header name. It should instead fail fast as these are not allowed by the spec and could lead to HTTP request smuggling. Failing to do the validation might cause netty to "sanitize" header names before it forward these to another remote system when used as proxy. This remote system can't see the invalid usage anymore, and therefore does not do the validation itself. Users should upgrade to version 4.1.71.Final.

    References: https://github.com/netty/netty/security/advisories/GHSA-wx5j-54mm-rqqq, https://lists.debian.org/debian-lts-announce/2023/01/msg00008.html, https://security.netapp.com/advisory/ntap-20220107-0003/, https://www.debian.org/security/2023/dsa-5316, https://github.com/netty/netty/commit/07aa6b5938a8b6ed7a6586e066400e2643897323, https://www.oracle.com/security-alerts/cpuapr2022.html, https://www.oracle.com/security-alerts/cpujul2022.html

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 1c36ce7b6f19282361f30643ce7b973545cbdd67
    Fixed -None

    Affected versions

    1.4.10

    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
    CVE-2021-43797 | CVE-DB