Security readout for executives and security teams
Plain-English summary
This CVE describes a denial-of-service issue in VSFTPD 3.0.3. An attacker may be able to consume the service’s limited connection capacity, making FTP unavailable. The source bundle provides no CVSS score, vendor fix, or confirmed affected platform list.
Executive priority
Treat this as an availability risk for exposed FTP services. Prioritize if FTP supports business operations, partners, backups, or file transfer workflows.
Technical view
CVE-2021-30047 is reported as a VSFTPD 3.0.3 denial-of-service condition tied to connection-limit exhaustion. The record cites an Exploit-DB entry, but the bundle does not provide patch details, CWE mapping, CVSS data, or evidence of active exploitation.
Likely exposure
Exposure is most likely where VSFTPD 3.0.3 is reachable by untrusted networks, especially internet-facing FTP services. The bundle’s affected-product metadata is incomplete.
Exploitation context
A public Exploit-DB reference exists. CISA KEV status is false, and the provided sources do not show confirmed active exploitation or weaponized campaign use.
Researcher notes
The public record is sparse. Avoid assuming affected builds beyond VSFTPD 3.0.3, and validate through package metadata and vendor guidance before assigning remediation status.
Mitigation direction
- Check vendor and distribution guidance for VSFTPD updates or configuration advice.
- Identify and prioritize internet-facing VSFTPD 3.0.3 services.
- Restrict FTP access to trusted networks where business permits.
- Use perimeter controls to reduce connection-flood exposure.
- Monitor FTP availability and connection saturation indicators.
Validation and detection
- Inventory FTP services and confirm VSFTPD versions.
- Verify whether any VSFTPD 3.0.3 instance is externally reachable.
- Review service logs for repeated connection exhaustion patterns.
- Check operating system package advisories for applicable fixes.
- Confirm compensating network controls are enforced.
Public sources used
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
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-30047 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.exploit-db.com/exploits/49719CVE reference
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.