CVE-2021-29441

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    CVE-2021-29441

    Published: 27 Apr 2021Last Modified: 9 Jul 2026

    Summary:

    Details: Nacos is a platform designed for dynamic service discovery and configuration and service management. In Nacos before version 1.4.1, when configured to use authentication (-Dnacos.core.auth.enabled=true) Nacos uses the AuthFilter servlet filter to enforce authentication. This filter has a backdoor that enables Nacos servers to bypass this filter and therefore skip authentication checks. This mechanism relies on the user-agent HTTP header so it can be easily spoofed. This issue may allow any user to carry out any administrative tasks on the Nacos server.

    References: https://github.com/alibaba/nacos/pull/4703, https://github.com/advisories/GHSA-36hp-jr8h-556f, https://github.com/alibaba/nacos/issues/4701

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -1d88d5d773c46912957a15cb6e78bd8b01c89fde

    Affected versions

    1.3.2
    1.3.1
    1.3.0-beta

    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-2021-29441 | CVE-DB