UBUNTU-CVE-2021-37533

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    UBUNTU-CVE-2021-37533

    Published: 3 Dec 2022Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-37533
    Aliases:
    USN-6037-1

    Summary:

    Details: Prior to Apache Commons Net 3.9.0, Net's FTP client trusts the host from PASV response by default. A malicious server can redirect the Commons Net code to use a different host, but the user has to connect to the malicious server in the first place. This may lead to leakage of information about services running on the private network of the client. The default in version 3.9.0 is now false to ignore such hosts, as cURL does. See https://issues.apache.org/jira/browse/NET-711.

    References: https://ubuntu.com/security/CVE-2021-37533, https://lists.apache.org/thread/o6yn9r9x6s94v97264hmgol1sf48mvx7, https://issues.apache.org/jira/browse/NET-711, https://github.com/apache/commons-net/commit/b0bff89f70cfea70009e22f87639816cc3993974, https://www.cve.org/CVERecord?id=CVE-2021-37533, https://ubuntu.com/security/notices/USN-6037-1

    Affected packages

    Package

    Name: libcommons-net-java

    Purl: pkg:deb/ubuntu/[email protected]+esm1?arch=source&distro=esm-apps/xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.4-2ubuntu2+esm1

    Affected versions

    3.3-2

    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
    UBUNTU-CVE-2021-37533 | CVE-DB