CVE-2020-27656

Name: CVE-2020-27656
Creator: NVD / NIST
Published: 2020-10-29T09:15:13.497+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.7/10EPSS 0.54%

Last modified Jun 17, 2026

CVE-2020-27656 is a low-severity vulnerability rated 3.7/10 on the CVSS scale. Cleartext transmission of sensitive information vulnerability in DDNS in Synology DiskStation Manager (DSM) before 6.2.3-25426-2 allows man-in-the-middle attackers to eavesdrop authentication information of DNSExit via unspecified vectors.. EPSS estimates a 0.54% chance of exploitation in the next 30 days.

Description

Cleartext transmission of sensitive information vulnerability in DDNS in Synology DiskStation Manager (DSM) before 6.2.3-25426-2 allows man-in-the-middle attackers to eavesdrop authentication information of DNSExit via unspecified vectors.

Metrics

CVSS 3.1

3.7/10

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

EPSS Probability

0.54%

41.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Synology	Diskstation Manager	>= 6.2, < 6.2.3-25426-2

References

https://www.synology.com/security/advisory/Synology_SA_20_18Vendor Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1071Exploit, Third Party Advisory
https://www.synology.com/security/advisory/Synology_SA_20_18Vendor Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1071Exploit, Third Party Advisory

Timeline

Published: Oct 29, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-27656?

How severe is CVE-2020-27656?

CVE-2020-27656 has a CVSS score of 3.7/10 (LOW severity). The EPSS model estimates a 0.54% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27656?

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-2020-27656?

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

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Source: NVD / NIST