Is CVE-2021-27648 in the CISA KEV catalog?

No. CVE-2021-27648 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-27648?

CVE-2021-27648 has a CVSS v3 base score of 9.0 (CRITICAL).

What is the EPSS score for CVE-2021-27648?

CVE-2021-27648 has an EPSS score of 2.84% (85th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-27648?

Upgrade antivirus essential to 1.4.8-2801 or later.

CVE & CISA-KEV Catalog

CVE-2021-27648

CRITICALEPSS 85th pctl

9.0

CVSS v3

NVD

Description

Externally controlled reference to a resource in another sphere in quarantine functionality in Synology Antivirus Essential before 1.4.8-2801 allows remote authenticated users to obtain privilege via unspecified vectors.

CWE-610

How to fix

Remediation Available

antivirus essentialNVD

Affected:< 1.4.8-2801Fixed in:1.4.8-2801CVE-2021-27648derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionRequired

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Exploit Intelligence

2.84%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Vendor Advisory1

synology.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.