CVE-2021-27648

Q: How do I fix CVE-2021-27648?

Upgrade antivirus essential to 1.4.8-2801 or later.

Q: Is CVE-2021-27648 being actively exploited?

Not that we know of. CVE-2021-27648 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 2.8% is the estimated probability that it will be exploited in the next 30 days. That is higher than 85% of all scored CVEs.

Q: How severe is CVE-2021-27648?

CVE-2021-27648 has a CVSS v3 base score of 9.0, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2021-27648 affect?

Published advisories record a fix for antivirus essential (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

Related Vulnerabilities

Other CWE-610 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-27593	Critical	10.0	88%	KEV + Ransom	Fix
CVE-2017-18357	Medium	6.5	27%	-	Fix
CVE-2022-2633	High	7.5	26%	-	-
CVE-2017-0211	Medium	5.5	14%	-	-
CVE-2024-45826	Medium	6.8	12%	-	Fix
CVE-2020-5412	Medium	6.5	10%	-	Fix

Common questions

How do I fix CVE-2021-27648?

Upgrade antivirus essential to 1.4.8-2801 or later.

Is CVE-2021-27648 being actively exploited?

Not that we know of. CVE-2021-27648 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 2.8% is the estimated probability that it will be exploited in the next 30 days. That is higher than 85% of all scored CVEs.

How severe is CVE-2021-27648?

CVE-2021-27648 has a CVSS v3 base score of 9.0, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-27648 affect?

Published advisories record a fix for antivirus essential (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2021-27648

Markdown

[![CVE-2021-27648](https://tridentstack.com/cve/badge/CVE-2021-27648.svg)](https://tridentstack.com/cve/CVE-2021-27648)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-27648"><img src="https://tridentstack.com/cve/badge/CVE-2021-27648.svg" alt="CVE-2021-27648"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

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.