Detections
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Linux Distros Unpatched Vulnerability : CVE-2021-37533

medium Nessus Plugin ID 224041

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Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

 - 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. (CVE-2021-37533)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2021-37533

Plugin Details

Severity: Medium

ID: 224041

File Name: unpatched_CVE_2021_37533.nasl

Version: 1.5

Type: Local

Agent: unix

Family: Misc.

Published: 3/5/2025

Updated: 8/4/2026

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.18

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2021-37533

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C

Vulnerability Information

CPE: cpe:/o:centos:centos:7, cpe:/o:centos:centos:8, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:centos:centos:apache-commons-net-javadoc, p-cpe:/a:centos:centos:apache-commons-net, p-cpe:/a:centos:centos:log4j-jcl, p-cpe:/a:centos:centos:log4j-slf4j, p-cpe:/a:centos:centos:log4j-web, p-cpe:/a:centos:centos:log4j, p-cpe:/a:redhat:enterprise_linux:apache-commons-net-javadoc, p-cpe:/a:redhat:enterprise_linux:apache-commons-net, p-cpe:/a:redhat:enterprise_linux:log4j-jcl, p-cpe:/a:redhat:enterprise_linux:log4j-slf4j, p-cpe:/a:redhat:enterprise_linux:log4j-web, p-cpe:/a:redhat:enterprise_linux:log4j

Required KB Items: Host/OS/identifier, Host/cpu, Host/local_checks_enabled, global_settings/vendor_unpatched

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 12/3/2022

Reference Information

CVE: CVE-2021-37533