Security readout for executives and security teams
Plain-English summary
This issue lets a valid FTP user on affected Synology DSM systems run operating-system commands through the DSM FTP service. It is not described as unauthenticated, but successful abuse could compromise confidentiality, integrity, and availability of the NAS.
Executive priority
Treat this as a high-priority NAS hardening and patching item, especially for exposed or multi-user Synology systems. Prioritize upgrade and FTP access reduction over extended investigation unless logs suggest abuse.
Technical view
CVE-2018-13284 is a CWE-78 command injection in ftpd in Synology DSM before 6.2-23739-1. Sources state remote authenticated users can execute arbitrary OS commands via MKD or RMD FTP commands. CVSS v3.0 is 7.5 high: network reachable, low privileges, high impact, but high attack complexity.
Likely exposure
Exposure is most likely where Synology DSM before 6.2-23739-1 has ftpd enabled and reachable by authenticated FTP users. Internet-facing FTP, shared credentials, or broad FTP access would increase business risk.
Exploitation context
The supplied sources do not show CISA KEV listing or active exploitation evidence. Exploitation requires authenticated FTP access and is rated high complexity, but impact is severe if achieved.
Researcher notes
The source bundle identifies the vulnerable component, affected product family, fixed-version threshold, command classes, CWE, and CVSS vector. It does not provide exploit telemetry, precise affected DSM branches, or detailed remediation beyond Synology advisory context.
Mitigation direction
- Upgrade affected DSM systems to 6.2-23739-1 or later vendor guidance.
- Disable Synology FTP service if it is not operationally required.
- Restrict FTP access to trusted networks and necessary users only.
- Review FTP accounts and remove unused or shared credentials.
- Monitor Synology and CVE sources for additional vendor guidance.
Validation and detection
- Inventory Synology DSM assets and record DSM versions.
- Confirm whether ftpd or FTP services are enabled.
- Verify affected systems are not running DSM before 6.2-23739-1.
- Review FTP access logs for unusual directory create or remove activity.
- Check whether FTP is exposed to the internet or broad internal networks.
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.
CWE-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-13284 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
- High
- CVSS
- 7.5 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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 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:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H1.65.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.5HighVector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.synology.com/security/advisory/Synology_SA_18_33CVE reference · x_refsource_CONFIRM
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 Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.