CVE-2021-32728

    Dashboard / Vulnerabilities / CVE-2021-32728

    CVE-2021-32728

    Published: 18 Aug 2021Last Modified: 8 Jul 2026

    Summary:

    Details: The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with a computer. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.3.0, the Nextcloud Desktop client fails to check if a private key belongs to previously downloaded public certificate. If the Nextcloud instance serves a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. This issue is fixed in Nextcloud Desktop Client version 3.3.0. There are no known workarounds aside from upgrading.

    References: https://www.debian.org/security/2021/dsa-4974, https://github.com/nextcloud/desktop/pull/3338, https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f5fr-5gcv-6cc5, https://hackerone.com/reports/1189162

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -acf3bf0959fc83393b71fbeed5b7633cab0f0d9d

    Affected versions

    v3.3.0-rc2
    v3.3.0-rc1

    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-2021-32728 | CVE-DB