CVE-2021-27648

Name: CVE-2021-27648
Creator: NVD / NIST
Published: 2021-04-28T08:15:07.69+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.84%

Last modified Jun 17, 2026

CVE-2021-27648 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 2.84% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

2.84%

84.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Synology	Antivirus Essential	< 1.4.8-2801

References

https://www.synology.com/security/advisory/Synology_SA_21_15Vendor Advisory
https://www.synology.com/security/advisory/Synology_SA_21_15Vendor Advisory

Timeline

Published: Apr 28, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27648?

How severe is CVE-2021-27648?

CVE-2021-27648 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.84% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27648?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-27648?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST