CVE-2021-37533
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.
Does this matter?
Lower severity and a low EPSS score (1.87%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- EPSS
- 1.87% probability · 78th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- apache/commons net · debian/debian linux
- Source
- security@apache.org
References
- http://www.openwall.com/lists/oss-security/2022/12/03/1Issue Tracking, Mailing List, Third Party Advisory
- https://lists.apache.org/thread/o6yn9r9x6s94v97264hmgol1sf48mvx7Issue Tracking, Mailing List, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/12/msg00038.htmlMailing List, Third Party Advisory
- https://www.debian.org/security/2022/dsa-5307Third Party Advisory
- http://www.openwall.com/lists/oss-security/2022/12/03/1Issue Tracking, Mailing List, Third Party Advisory
- https://lists.apache.org/thread/o6yn9r9x6s94v97264hmgol1sf48mvx7Issue Tracking, Mailing List, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/12/msg00038.htmlMailing List, Third Party Advisory
- https://www.debian.org/security/2022/dsa-5307Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.