CVE-2021-31439

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    CVE-2021-31439

    Published: 21 May 2021Last Modified: 8 Jul 2026

    Summary:

    Details: 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.

    References: https://lists.debian.org/debian-lts-announce/2023/05/msg00018.html, https://www.debian.org/security/2023/dsa-5503, https://www.synology.com/zh-hk/security/advisory/Synology_SA_20_26, https://www.zerodayinitiative.com/advisories/ZDI-21-492/, https://security.gentoo.org/glsa/202311-02

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -8965445d8439dbe1b2821b783ae644da3ef600a1

    Affected versions

    netatalk-3-1-12

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-31439 | CVE-DB