What is CVE-2021-26561?

CVE-2021-26561 is a critical-severity vulnerability in Synology Diskstation Manager (Dsm), classified under Stack-based Buffer Overflow. CVSS score: 9.0/10. Published 2021-02-26.

How severe is CVE-2021-26561?

Critical severity. CVSS v3 base score is 9.0 out of 10.

Buffer overflow in Synology Diskstation Manager (Dsm)

CVE-2021-26561

Stack-based buffer overflow vulnerability in synoagentregisterd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to execute arbitrary code via syno_finder_site HTTP header.

Vulnerability class: Buffer Overflow

EPSS: 0.023 (85.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Synology Diskstation Manager (Dsm) — versions unspecified

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

www.synology.com/security/advisory/Synology_SA_20_26 (x_refsource_CONFIRM)
www.talosintelligence.com/vulnerability_reports/TALOS-2020-1159 (x_refsource_MISC)

Frequently asked questions

What is CVE-2021-26561?: CVE-2021-26561 is a critical-severity vulnerability in Synology Diskstation Manager (Dsm), classified under Stack-based Buffer Overflow. CVSS score: 9.0/10. Published 2021-02-26.
How severe is CVE-2021-26561?: Critical severity. CVSS v3 base score is 9.0 out of 10.