CVE-2021-37533
6.5 · MEDIUMOverview
CVE-2021-37533 is a medium-severity vulnerability affecting apache commons_net. It was published on December 3, 2022 and has a CVSS 3.1 base score of 6.5 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from apache. Update commons_net to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| apache | commons_net | >= 0, < 3.9.0 | Affected |
References
Frequently Asked Questions
What is CVE-2021-37533?
CVE-2021-37533 is a medium-severity vulnerability affecting apache commons_net. It was published on December 3, 2022 and has a CVSS 3.1 base score of 6.5 (MEDIUM).
How severe is CVE-2021-37533?
This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-37533?
Check the references section for vendor advisories and patches from apache. Update commons_net to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-37533?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-37533 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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