Security readout for executives and security teams
Apache Commons Net FTP clients before 3.9.0 could trust a server-provided passive-mode host. If a user or system connects to a malicious FTP server, that server may redirect the client toward another host, potentially revealing information about private network services. Exposure is most likely in Java applications, scripts, or packaged systems using Apache Commons Net FTP client before 3.9.0. Risk is higher when systems connect to untrusted or user-supplied FTP servers from networks with private internal services. Treat as a targeted confidentiality risk, not an emergency internet-wide compromise. Prioritize systems that initiate FTP connections from internal networks or handle sensitive environments, then remediate through dependency and package updates. Mitigation focus: Upgrade Apache Commons Net to 3.9.0 or later.; Apply fixed distribution packages such as Debian security updates where applicable.; Identify applications using libcommons-net-java or bundled Commons Net jars..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-20: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-37533 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
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CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://lists.apache.org/thread/o6yn9r9x6s94v97264hmgol1sf48mvx7CVE reference
- [debian-lts-announce] 20221229 [SECURITY] [DLA 3251-1] libcommons-net-java security updateCVE reference · mailing-list
- DSA-5307CVE reference · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.