CVE-2021-31439: Debian Linux

High severity, CVSS 8.8. EPSS: 2.3% chance of exploitation in the next 30 days.

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Synology DiskStation Manager. Authentication is not required to exploit this vulnerablity. The specific flaw exists within the processing of DSI structures in Netatalk. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-12326.

Affected products

• Debian Debian Linux: version 10.0 only; version 11.0 only
• Netatalk Netatalk: before 3.1.13 (fixed in 3.1.13)
• Synology Diskstation Manager: from 6.2, before 6.2.3-25426-3 (fixed in 6.2.3-25426-3)

Published 2021-05-21. Last modified 2026-06-17.