CVE-2024-11399: Synology BeeDrive DoS Vulnerability

CVE-2024-11399 Overview

CVE-2024-11399 affects the redis-server component bundled with Synology BeeDrive for desktop versions prior to 1.3.2-13814. The flaw is classified as files or directories accessible to external parties [CWE-552]. Local users can leverage exposed resources to trigger a denial-of-service condition against the BeeDrive client. Exploitation requires local access to the host running BeeDrive but does not require authentication or user interaction. Synology addressed the issue in BeeDrive 1.3.2-13814 and published advisory SA-24-26 to document the fix.

Critical Impact

Local attackers can crash or disrupt the BeeDrive desktop client by abusing improperly restricted files or directories used by the embedded redis-server, resulting in loss of availability for the synchronization service.

Affected Products

• Synology BeeDrive for desktop versions prior to 1.3.2-13814
• Embedded redis-server component shipped with BeeDrive
• Windows and macOS desktop installations of BeeDrive sync client

Discovery Timeline

• 2026-05-27 - CVE-2024-11399 published to NVD
• 2026-05-27 - Last updated in NVD database
• Reference - Synology Security Advisory SA-24-26

Technical Details for CVE-2024-11399

Vulnerability Analysis

The vulnerability resides in the redis-server component used internally by Synology BeeDrive for desktop. BeeDrive embeds Redis to manage local state, queue operations, and coordinate synchronization between the desktop client and Synology cloud or NAS endpoints. The advisory categorizes the issue as exposure of files or directories to external parties, meaning resources used by redis-server are reachable by local actors who should not have access. A local user can abuse this exposure to interfere with the Redis instance and disrupt BeeDrive operation.

The attack vector is local, attack complexity is low, no privileges are required, and no user interaction is needed. Confidentiality is not affected, integrity sees limited impact, and availability is heavily impacted. The advisory does not detail the specific exposed paths or mechanism beyond stating that unspecified vectors enable denial-of-service.

Root Cause

The root cause is improper restriction of files or directories used by the embedded redis-server process. Resources such as Unix sockets, TCP listeners bound to loopback, configuration files, or working directories appear to be accessible to local non-privileged users. This violates least-privilege expectations for a desktop background service that should be scoped to a single user account.

Attack Vector

A local user on a system where Synology BeeDrive is installed interacts with the exposed redis-server resources to trigger a denial-of-service condition. The disruption affects the BeeDrive client and its synchronization tasks. The advisory states the vectors are unspecified, and no public proof-of-concept exploit has been published. The EPSS score remains very low, reflecting limited likelihood of widespread exploitation.

No verified exploit code is available for this vulnerability. Refer to the Synology Security Advisory SA-24-26 for vendor-supplied technical context.

Detection Methods for CVE-2024-11399

Indicators of Compromise

• Unexpected termination or repeated restarts of the BeeDrive redis-server child process on desktop endpoints
• BeeDrive synchronization failures or stalled sync queues following local user activity
• Unauthorized local processes accessing BeeDrive working directories or Redis socket files

Detection Strategies

• Inventory desktop endpoints to identify Synology BeeDrive installations and confirm whether the installed version is earlier than 1.3.2-13814
• Monitor process telemetry for non-BeeDrive processes opening handles to BeeDrive Redis files, sockets, or loopback listeners
• Alert on crash events and abnormal exit codes from the redis-server instance launched by the BeeDrive client

Monitoring Recommendations

• Collect endpoint process creation and file access events for the BeeDrive installation directory and per-user application data paths
• Track service health metrics for the BeeDrive client to detect availability degradation that may indicate exploitation attempts
• Forward desktop endpoint logs to a centralized analytics platform to correlate local user activity with BeeDrive disruption events

How to Mitigate CVE-2024-11399

Immediate Actions Required

• Upgrade Synology BeeDrive for desktop to version 1.3.2-13814 or later on every affected workstation
• Identify hosts where multiple local user accounts share the same machine and prioritize patching those endpoints first
• Validate that the BeeDrive auto-update mechanism is functional and not blocked by endpoint policy

Patch Information

Synology released the fix in BeeDrive for desktop 1.3.2-13814. The patch is documented in Synology Security Advisory SA-24-26. Administrators should download the updated installer from the Synology download portal and deploy it through standard software distribution tooling. Verify the installed version after deployment by checking the BeeDrive client About dialog or the installer registry entry.

Workarounds

• Restrict shared local access on systems running BeeDrive until the patched version is installed
• Limit BeeDrive installation to single-user workstations where additional local accounts are not provisioned
• Uninstall BeeDrive on endpoints where it is not required pending verification of the patched release