What is CVE-2018-8929?

CVE-2018-8929 is a high-severity vulnerability in Synology SSL Vpn Client, classified under Cleartext Transmission of Sensitive Information. CVSS score: 7.3/10. Published 2018-07-06.

How severe is CVE-2018-8929?

High severity. CVSS v3 base score is 7.3 out of 10.

Vulnerability in Synology SSL Vpn Client

CVE-2018-8929

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.

Published 2018-07-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.008 (54.2th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Synology SSL Vpn Client — versions unspecified
Synology SSL Vpn Client

Weakness classification (CWE)

References

www.synology.com/en-global/support/security/Synology_SA_18_19 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-8929?: CVE-2018-8929 is a high-severity vulnerability in Synology SSL Vpn Client, classified under Cleartext Transmission of Sensitive Information. CVSS score: 7.3/10. Published 2018-07-06.
How severe is CVE-2018-8929?: High severity. CVSS v3 base score is 7.3 out of 10.