CVE-2021-43824

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    CVE-2021-43824

    Published: 22 Feb 2022Last Modified: 7 Aug 2026

    Summary:

    Details: Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions a crafted request crashes Envoy when a CONNECT request is sent to JWT filter configured with regex match. This provides a denial of service attack vector. The only workaround is to not use regex in the JWT filter. Users are advised to upgrade.

    References: https://github.com/envoyproxy/envoy/security/advisories/GHSA-vj5m-rch8-5r2p, https://github.com/envoyproxy/envoy/commit/9371333230b1a6e1be2eccf4868771e11af6253a

    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-2021-43824 | CVE-DB