CVE-2021-37533
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability82. percentile2.1%
Product
Apache Commons Net
PublishedDec 3, 2022
First seenDec 3, 2022
Weakness typeCWE-20Improper input validation
How to fix
Update
- apache commons_net3.9.0 or later
- commons-net:commons-net3.9.0 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| apache commons_net | v < 3.9.0 | 3.9.0 |
| debian debian_linux | 10.0, 11.0 | — |
| commons-net:commons-netMaven | v < 3.9.0 | 3.9.0 |
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