Vulnerability Details : 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.
Products affected by CVE-2021-37533
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
- cpe:2.3:a:apache:commons_net:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-37533
0.18%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 40 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-37533
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |
2.8
|
3.6
|
134c704f-9b21-4f2e-91b3-4a467353bcc0 | 2025-04-24 |
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |
2.8
|
3.6
|
NIST | |
|
6.5
|
MEDIUM | AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |
N/A
|
N/A
|
Oracle:CPUOct2023 |
CWE ids for CVE-2021-37533
-
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.Assigned by: security@apache.org (Secondary)
References for CVE-2021-37533
-
https://www.debian.org/security/2022/dsa-5307
Debian -- Security Information -- DSA-5307-1 libcommons-net-javaThird Party Advisory
-
https://lists.debian.org/debian-lts-announce/2022/12/msg00038.html
[SECURITY] [DLA 3251-1] libcommons-net-java security updateMailing List;Third Party Advisory
-
http://www.openwall.com/lists/oss-security/2022/12/03/1
oss-security - CVE-2021-37533: Apache Commons Net's FTP client trusts the host from PASV response by defaultIssue Tracking;Mailing List;Third Party Advisory
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https://lists.apache.org/thread/o6yn9r9x6s94v97264hmgol1sf48mvx7
CVE-2021-37533: Apache Commons Net's FTP client trusts the host from PASV response by default-Apache Mail ArchivesIssue Tracking;Mailing List;Vendor Advisory
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