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Vulnerability record · CVE-2020-27649 · published 29 October 2020

CVE-2020-27649: Synology router manager improper certificate validation vulnerability

Synology · Router Manager

Improper certificate validation vulnerability in OpenVPN client in Synology Router Manager (SRM) before 1.2.4-8081 allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

9.0 CVSS 3.1 Critical EPSS 0.72% · top 48.0% CWE-295 · Improper certificate validation
9.0CVSS 3.1 base score, v2 6.8
0.72%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Improper certificate validation vulnerability in OpenVPN client in Synology Router Manager (SRM) before 1.2.4-8081 allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/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/security/advisory/Synology_SA_20_14 Vendor Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1058 ExploitThird Party Advisory
https://www.synology.com/security/advisory/Synology_SA_20_14 Vendor Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1058 ExploitThird Party Advisory

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Related vulnerabilities

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

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Source: NIST National Vulnerability Database (record CVE-2020-27649), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.