How severe is CVE-2020-27660?

CVE-2020-27660 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-27660 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-27660?

CVE-2020-27660 affects Synology Safeaccess. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-27660?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-27660 published?

CVE-2020-27660 was published on 2020-11-30 and last updated on 2026-06-17.

CVE-2020-27660

CVE-2020-27660 is a critical-severity vulnerability in Synology Safeaccess with a CVSS 3.x base score of 9.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
CVSS v2: 10.0
EPSS exploit prediction: 5% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Synology Safeaccess
Published: 2020-11-30
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2020-27660?: CVE-2020-27660 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-27660 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-27660?: CVE-2020-27660 affects Synology Safeaccess. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-27660?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-27660 published?: CVE-2020-27660 was published on 2020-11-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:synology:safeaccess:*:*:*:*:*:*:*:*

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