What is CVE-2020-27660?

CVE-2020-27660 is a critical-severity vulnerability in Synology Safe Access, classified under SQL Injection. CVSS score: 9.6/10. Published 2020-11-30.

How severe is CVE-2020-27660?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Is CVE-2020-27660 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

SQL Injection in Synology Safe Access

CVE-2020-27660

SQL injection vulnerability in request.cgi in Synology SafeAccess before 1.2.3-0234 allows remote attackers to execute arbitrary SQL commands via the domain parameter.

Vulnerability class: SQL Injection

Published 2020-11-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.046 (91.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.046 · newest: 0.046 · change: 0.000

Affected products

Synology Safe Access — versions unspecified
Synology Safeaccess

Weakness classification (CWE)

CWE-89 — SQL Injection

Public proof-of-concept exploits

References

www.synology.com/security/advisory/Synology_SA_20_25 (Vendor Advisory)
www.talosintelligence.com/vulnerability_reports/TALOS-2020-1087 (Exploit, Third Party Advisory)
github.com/thomasfady/Synology_SA_20_25 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-27660?: CVE-2020-27660 is a critical-severity vulnerability in Synology Safe Access, classified under SQL Injection. CVSS score: 9.6/10. Published 2020-11-30.
How severe is CVE-2020-27660?: Critical severity. CVSS v3 base score is 9.6 out of 10.
Is CVE-2020-27660 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.