CVE-2021-37533

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

2.12% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 81.8% of scored records. A rank, not a probability.

NVD base score

6.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2022-12-03 00:00Z3 YR AGO

Last updated

2025-04-24 15:25Z1 YR AGO

Reserved

2021-07-26

Assigning CNA

apache

Record state

PUBLISHED

Severity

Medium (CVSS 6.5)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Weaknesses

• CWE-20Improper Input ValidationClass

Data version

5.1

Document digest

d61fadad01d3fba4594f9ddbc051149559d7775e8fa3821f3371753194aa5a1c

• lists.apache.orghttps://lists.apache.org/thread/o6yn9r9x6s94v97264hmgol1sf48mvx7
• www.openwall.com[oss-security] 20221203 CVE-2021-37533: Apache Commons Net's FTP client trusts the host from PASV response by defaulthttp://www.openwall.com/lists/oss-security/2022/12/03/1mailing-list
• lists.debian.org[debian-lts-announce] 20221229 [SECURITY] [DLA 3251-1] libcommons-net-java security updatehttps://lists.debian.org/debian-lts-announce/2022/12/msg00038.htmlmailing-list
• www.debian.orgDSA-5307https://www.debian.org/security/2022/dsa-5307vendor-advisory