What is CVE-2025-12686?

CVE-2025-12686 is a critical-severity vulnerability in Synology Beestation Manager (Bsm), classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2026-05-27.

How severe is CVE-2025-12686?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Synology Beestation Manager (Bsm)

CVE-2025-12686

Buffer copy without checking size of input ('Classic Buffer Overflow') vulnerability in AdminCenter in Synology BeeStation OS before 1.3.2-65648 allows remote attackers to execute arbitrary code via unspecified vectors.

Vulnerability class: Buffer Overflow

EPSS: 0.003 (50.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Synology Beestation Manager (Bsm) — versions 1.2, 1.1, 1.0
Synology Beestation Os — versions 1.0, 1.3, 1.1
Synology Beestation_os

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

security@synology.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2025-12686?: CVE-2025-12686 is a critical-severity vulnerability in Synology Beestation Manager (Bsm), classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2026-05-27.
How severe is CVE-2025-12686?: Critical severity. CVSS v3 base score is 9.8 out of 10.