CVE-2021-22915

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    CVE-2021-22915

    Published: 11 Jun 2021Last Modified: 7 Aug 2026

    Summary:

    Details: Nextcloud server before 19.0.11, 20.0.10, 21.0.2 is vulnerable to brute force attacks due to lack of inclusion of IPv6 subnets in rate-limiting considerations. This could potentially result in an attacker bypassing rate-limit controls such as the Nextcloud brute-force protection.

    References: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AGXGR6HYGQ6MZXISMJEHCOXRGRFRUFMA/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S/, https://nextcloud.com/security/advisory/?id=NC-SA-2021-009, https://hackerone.com/reports/1154003

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -ea6649a511ec5963b984342a50103c3637d621a3

    Affected versions

    v19.0.11RC1
    v19.0.10
    v19.0.10RC1
    v19.0.9
    v19.0.9RC1
    v19.0.8
    v19.0.8RC1
    v19.0.7
    v19.0.7RC1
    v19.0.6
    v19.0.6RC2
    v19.0.5
    v19.0.5RC2
    v19.0.5RC1
    v19.0.4
    v19.0.4RC2
    v19.0.40RC1
    v19.0.3
    v19.0.3RC1
    v19.0.2
    v19.0.2RC2
    v19.0.2RC1
    v19.0.1
    v19.0.1RC1
    v19.0.0
    v19.0.0RC3
    v19.0.0RC1
    v19.0.0beta7
    v19.0.0beta6
    v19.0.0beta5
    v19.0.0beta4
    v19.0.0beta3
    v19.0.0beta2
    v19.0.0beta1

    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-2021-22915 | CVE-DB