Is CVE-2021-26560 in the CISA KEV catalog?

No. CVE-2021-26560 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-26560?

CVE-2021-26560 has a CVSS v3 base score of 9.0 (CRITICAL).

What is the EPSS score for CVE-2021-26560?

CVE-2021-26560 has an EPSS score of 0.69% (48th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-26560?

Upgrade diskstation manager to 6.2.3-25426-3 or later.

CVE & CISA-KEV Catalog

CVE-2021-26560

CRITICAL

9.0

CVSS v3

NVD

Description

Cleartext transmission of sensitive information vulnerability in synoagentregisterd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to spoof servers via an HTTP session.

CWE-319

How to fix

Remediation Available

diskstation managerNVD

Affected:< 6.2.3-25426-3Fixed in:6.2.3-25426-3CVE-2021-26560derived 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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.69%probability of exploitation in 30 days

48thpercentile

Moderate risk: more likely to be exploited than 48% of all known CVEs.

References

Exploit1

talosintelligence.com

Vendor Advisory1

synology.com

Related Vulnerabilities

Other CWE-319 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2018-12710	High	8.0	77%	-	-
CVE-2024-25735	Critical	9.1	51%	-	Fix
CVE-2019-3993	High	7.5	46%	-	-
CVE-2017-5259	High	8.8	39%	-	-
CVE-2016-5649	Critical	9.8	27%	-	-
CVE-2021-39341	High	8.2	23%	-	-

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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 2025-01-14.