Security readout for executives and security teams
Plain-English summary
CVE-2018-8929 affects Synology SSL VPN Client before 1.2.4-0224. A remote attacker positioned to interfere with communications could conduct a man-in-the-middle attack, potentially weakening confidentiality, integrity, and availability of VPN client traffic.
Executive priority
Treat as a high-priority hygiene fix for organizations using Synology SSL VPN Client. The main business concern is traffic interception risk, especially for remote access users on untrusted networks.
Technical view
The issue is an improper restriction of the communication channel to intended endpoints in the Synology SSL VPN Client HTTP daemon. The CVE maps to CWE-319 and has CVSS 3.0 score 7.3, with network attack vector, low complexity, no privileges, and no user interaction required.
Likely exposure
Exposure is limited to systems running Synology SSL VPN Client versions before 1.2.4-0224. Risk is higher for clients used on untrusted or attacker-controlled networks.
Exploitation context
The source states remote attackers can conduct man-in-the-middle attacks via a crafted payload. The provided bundle says this CVE is not in KEV, and no cited source claims active exploitation.
Researcher notes
Evidence is narrow: affected product and fixed-version boundary are clear, but the provided sources do not include exploit details, indicators of compromise, or broader affected CPE data.
Mitigation direction
- Upgrade Synology SSL VPN Client to version 1.2.4-0224 or later.
- Review Synology advisory SA-18:19 for vendor-specific guidance.
- Prioritize remote users and devices that connect from untrusted networks.
- Remove or disable obsolete Synology SSL VPN Client installations.
Validation and detection
- Inventory endpoints for Synology SSL VPN Client installations.
- Confirm installed versions are 1.2.4-0224 or later.
- Check vulnerability scanner results against CVE-2018-8929.
- Review VPN client deployment records for unmanaged or stale 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-319: 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-2018-8929 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
- 7.3 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
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:N/S:U/C:L/I:L/A:L3.93.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.3HighVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://www.synology.com/en-global/support/security/Synology_SA_18_19CVE 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.
Cleartext Transmission of Sensitive Information
Cleartext Transmission of Sensitive Information represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.