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CVE-2021-31439

HIGH
8.8
CVSS Score
Published: May 21, 2021 at 12:00 AM UTC
Updated: June 17, 2026 at 03:51 AM UTC
3 products affected across 3 vendorsDebian LinuxDiskStation ManagerNetatalk

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Severity
HIGH8.8
Exploit prediction
EPSS 2%

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
10.011.0
Netatalk· Netatalk
95%
v < 3.1.13
Affected range stops below 3.1.13, so it looks safe — our inference, not a vendor statement
DiskStation Manager· Synology
95%
6.2 ≤ v < 6.2.3-25426-36.1.1-15101-4
Affected range stops below 6.2.3-25426-3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

Mailing ListThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2023/05/msg00018.html
Vendor AdvisoryIssue TrackingThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202311-02
Vendor AdvisoryThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2023/dsa-5503
Vendor Advisory
Source: [email protected]
https://www.synology.com/zh-hk/security/advisory/Synology_SA_20_26
Third Party AdvisoryVDB Entry
Source: [email protected]
https://www.zerodayinitiative.com/advisories/ZDI-21-492/

CVSS

8.8HIGH[email protected]
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-122CWE-787

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