CVE-2021-43825

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    CVE-2021-43825

    Published: 22 Feb 2022Last Modified: 7 Aug 2026

    Summary:

    Details: Envoy is an open source edge and service proxy, designed for cloud-native applications. Sending a locally generated response must stop further processing of request or response data. Envoy tracks the amount of buffered request and response data and aborts the request if the amount of buffered data is over the limit by sending 413 or 500 responses. However when the buffer overflows while response is processed by the filter chain the operation may not be aborted correctly and result in accessing a freed memory block. If this happens Envoy will crash resulting in a denial of service.

    References: https://github.com/envoyproxy/envoy/security/advisories/GHSA-h69p-g6xg-mhhh, https://github.com/envoyproxy/envoy/commit/148de954ed3585d8b4298b424aa24916d0de6136

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -a79ca225f1ed924b855dff8a26bd7f7cdb84e694

    Affected versions

    v1.21.0

    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-2021-43825 | CVE-DB