What is CVE-2021-26566?

CVE-2021-26566 is a high-severity vulnerability in Synology Diskstation Manager (Dsm), classified under Insertion of Sensitive Information into Sent Data. CVSS score: 8.3/10. Published 2021-02-26.

How severe is CVE-2021-26566?

High severity. CVSS v3 base score is 8.3 out of 10.

Is CVE-2021-26566 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Synology Diskstation Manager (Dsm)

CVE-2021-26566

Insertion of sensitive information into sent data vulnerability in synorelayd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to execute arbitrary commands via inbound QuickConnect traffic.

EPSS: 0.005 (67.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Synology Diskstation Manager (Dsm) — versions unspecified

Weakness classification (CWE)

CWE-201 — Insertion of Sensitive Information into Sent Data

Public proof-of-concept exploits

Live-Hack-CVE/CVE-2021-26566

References

www.synology.com/security/advisory/Synology_SA_20_26 (x_refsource_CONFIRM)
www.talosintelligence.com/vulnerability_reports/TALOS-2020-1160 (x_refsource_MISC)

Frequently asked questions

What is CVE-2021-26566?: CVE-2021-26566 is a high-severity vulnerability in Synology Diskstation Manager (Dsm), classified under Insertion of Sensitive Information into Sent Data. CVSS score: 8.3/10. Published 2021-02-26.
How severe is CVE-2021-26566?: High severity. CVSS v3 base score is 8.3 out of 10.
Is CVE-2021-26566 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.