Advisory Details

December 3rd, 2025

(Pwn2Own) Synology BeeStation Plus auth_info Stack-based Buffer Overflow Remote Code Execution Vulnerability

CVE ID	CVE-2025-12686
CVSS SCORE	9.8, AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Synology
AFFECTED PRODUCTS	BeeStation Plus
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on affected installations of Synology BeeStation Plus. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of the auth_info parameter. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root.
ADDITIONAL DETAILS	Synology has issued an update to correct this vulnerability. More details can be found at: https://www.synology.com/en-us/security/advisory/Synology_SA_25_12
DISCLOSURE TIMELINE	2025-11-20 - Vulnerability reported to vendor 2025-12-03 - Coordinated public release of advisory 2025-12-03 - Advisory Updated
CREDIT	@Tek_7987 and @_Anyfun (both working @Synacktiv)

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