Improper input validation in Apache Commons Net
CVE-2021-37533
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.019 (77.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
Affected products
- Apache Commons_net
- Apache Software Foundation Commons Net — versions Apache Commons Net
- Debian Debian_linux — versions 10.0, 11.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@apache.org (Mailing List, Issue Tracking, Vendor Advisory)
- security@apache.org (mailing-list, Mailing List, Third Party Advisory, Issue Tracking)
- security@apache.org (mailing-list, Mailing List, Third Party Advisory)
- security@apache.org (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-37533?
- CVE-2021-37533 is a medium-severity vulnerability in Apache Commons Net, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2022-12-03.
- How severe is CVE-2021-37533?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2021-37533 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.