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Vulnerability record · CVE-2018-8929 · published 6 July 2018

CVE-2018-8929: Synology ssl vpn client cleartext transmission vulnerability

Synology · Ssl Vpn Client

Improper restriction of communication channel to intended endpoints vulnerability in HTTP daemon in Synology SSL VPN Client before 1.2.4-0224 allows remote attackers to conduct man-in-the-middle attacks via a crafted payload.

8.1 CVSS 3.0 High EPSS 0.75% · top 46.8% CWE-319 · Cleartext transmissionCWE-417 · CWE-417
8.1CVSS 3.0 base score, v2 6.8
0.75%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Improper restriction of communication channel to intended endpoints vulnerability in HTTP daemon in Synology SSL VPN Client before 1.2.4-0224 allows remote attackers to conduct man-in-the-middle attacks via a crafted payload.

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.synology.com/en-global/support/security/Synology_SA_18_19 Vendor Advisory
https://www.synology.com/en-global/support/security/Synology_SA_18_19 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.1CVE-2021-47961Synology ssl vpn client vulnerabilityA plaintext storage of a password vulnerability in Synology SSL VPN Client before 1.4.5-0684 allows remote attackers to access or influence the user'…EPSS 0.32%7.4CVE-2018-13283Synology ssl vpn client vulnerabilityLack of administrator control over security vulnerability in client.cgi in Synology SSL VPN Client before 1.2.5-0226 allows remote attackers to condu…EPSS 1.4%6.5CVE-2021-47960Synology ssl vpn client vulnerabilityA files or directories accessible to external parties vulnerability in Synology SSL VPN Client before 1.4.5-0684 allows remote attackers to access fi…EPSS 0.19%5.5CVE-2023-5748Synology ssl vpn client classic buffer overflow vulnerabilityBuffer copy without checking size of input ('Classic Buffer Overflow') vulnerability in cgi component in Synology SSL VPN Client before 1.4.7-0687 al…EPSS 0.19%

Source: NIST National Vulnerability Database (record CVE-2018-8929), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.