Security readout for executives and security teams
Plain-English summary
This vulnerability affects Synology SSL VPN Client versions before 1.2.5-0226. A remote attacker could manipulate client.cgi parameters in a way that enables a man-in-the-middle attack, potentially exposing or altering VPN traffic if a user interacts with the vulnerable client.
Executive priority
Treat this as a high-priority client upgrade if Synology SSL VPN Client is deployed. It can affect VPN trust and traffic security, but the evidence bundle does not indicate known active exploitation.
Technical view
CVE-2018-13283 is a CWE-671 administrator-control weakness in client.cgi. The CVE states remote unauthenticated attackers can conduct man-in-the-middle attacks through command, hostname, or port parameters. CVSS 3.0 is 8.8 with network attack vector, low complexity, no privileges required, and user interaction required.
Likely exposure
Exposure is limited to organizations running Synology SSL VPN Client versions before 1.2.5-0226. Risk is most relevant where users connect from untrusted networks or where client connection parameters could be influenced before or during VPN use.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation evidence. The issue is still serious because successful exploitation could compromise confidentiality, integrity, and availability of VPN communications, but user interaction is required under the CVSS vector.
Researcher notes
The source bundle identifies the vulnerable component and parameters but does not include exploit details, affected platform matrix, or compensating controls beyond version context. Validation should focus on product presence, client version, and alignment with the Synology advisory.
Mitigation direction
- Inventory Synology SSL VPN Client installations and versions.
- Update affected clients to 1.2.5-0226 or later.
- Review Synology advisory Synology_SA_18_30 for vendor guidance.
- Prioritize users who connect from public or untrusted networks.
- Monitor for suspicious VPN endpoint or connection-parameter anomalies.
Validation and detection
- Confirm no deployed client version is earlier than 1.2.5-0226.
- Verify Synology SSL VPN Client is actually in use before scoping remediation.
- Review VPN support tickets for connection warnings or unexpected endpoint reports.
- Check asset records for unmanaged systems using old Synology VPN clients.
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-671: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupCVE-2018-13283 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
- 8.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/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:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.8HighVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/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_30CVE 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.
Lack of Administrator Control over Security
Lack of Administrator Control over Security represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.