CVSS 3.1
6.5 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:NCVE-2021-37533
Medium (6.5). EPSS 2.1% chance of exploitation in the next 30 days. Fixed in commons-net:commons-net 3.9.0.
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.
Severity
- EPSS
- 2.1% chance of exploitation in the next 30 days; higher than 81% of CVEs (scores of 2026-10-31)
- CWE
- CWE-20
- Published
- Modified
- Record from
- the NVD, synced
Affected
- apache:commons_net
- debian:debian_linux
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-cgp8-4m63-fhh5 | Maven | commons-net:commons-net | <3.9.0 | 3.9.0 |