CVE-2021-31439

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.

• CWE-122
• CWE-787

• https://lists.debian.org/debian-lts-announce/2023/05/msg00018.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/202311-02Issue Tracking, Third Party Advisory
• https://www.debian.org/security/2023/dsa-5503Third Party Advisory
• https://www.synology.com/zh-hk/security/advisory/Synology_SA_20_26Vendor Advisory
• https://www.zerodayinitiative.com/advisories/ZDI-21-492/Third Party Advisory, VDB Entry
• https://lists.debian.org/debian-lts-announce/2023/05/msg00018.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/202311-02Issue Tracking, Third Party Advisory
• https://www.debian.org/security/2023/dsa-5503Third Party Advisory
• https://www.synology.com/zh-hk/security/advisory/Synology_SA_20_26Vendor Advisory
• https://www.zerodayinitiative.com/advisories/ZDI-21-492/Third Party Advisory, VDB Entry

Published

May 21, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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