Apache Commons Net vulnerable to information leakage via malicious server
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | commons-net:commons-net | < 3.9.0 | 3.9.0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-37533
- https://github.com/apache/commons-net/commit/4fe1bae56e53f32756b1ca3296f3dd2c45e3e060
- https://github.com/apache/commons-net
- https://issues.apache.org/jira/browse/NET-711
- https://lists.apache.org/thread/o6yn9r9x6s94v97264hmgol1sf48mvx7
- https://lists.debian.org/debian-lts-announce/2022/12/msg00038.html
- https://www.debian.org/security/2022/dsa-5307
- http://www.openwall.com/lists/oss-security/2022/12/03/1
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-20- Platform
- Java / Kotlin (Maven)
- Package
commons-net:commons-net- Disclosed
- 03.12.2022
- Updated
- 11.10.2026 13:19
Sources and licenses
OSV / GitHub Advisory Database - GHSA-cgp8-4m63-fhh5 - CC BY 4.0
Vulnerability history: commons-net:commons-net
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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