CVE-2021-37533

Apache Commons Net's FTP client trusts the host from PASV response by default

Published Dec 3, 2022 CVSS 3.1 · 6.5 Medium EPSS 2.2% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-3251-1 libcommons-net-java security update
Debian DSA Debian DSA DSA-5307-1 libcommons-net-java security update
EUVD EUVD EUVD-2022-7599 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.
Github GHSA Github GHSA GHSA-cgp8-4m63-fhh5 Apache Commons Net vulnerable to information leakage via malicious server
Ubuntu USN Ubuntu USN USN-6037-1 Apache Commons Net vulnerability
History
Type Values Removed Values Added
Metrics epss

{'score': 0.00197}

epss

{'score': 0.00162}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
apache
Published
Updated
Apr 24, 2025, 3:25 PM
Reserved
Jul 26, 2021, 12:00 AM
Status
Modified
Published
Dec 3, 2022, 3:15 PM
Modified
Jun 17, 2026, 4:00 AM
Severity
Moderate
Public date
Feb 15, 2023, 12:00 AM