CVE-2025-69430
Unknown Unknown - Not Provided

Incorrect Symlink Follow in Yottamaster NAS Enables File Tampering

Publication date: 2026-02-03

Last updated on: 2026-02-11

Assigner: MITRE

Description
An Incorrect Symlink Follow vulnerability exists in multiple Yottamaster NAS devices, including DM2 (version equal to or prior to V1.9.12), DM3 (version equal to or prior to V1.9.12), and DM200 (version equal to or prior to V1.2.23) that could be exploited by attackers to leak or tamper with the internal file system. Attackers can format a USB drive to ext4, create a symbolic link to its root directory, insert the drive into the NAS device's slot, then access the USB drive's symlink directory mounted on the NAS to obtain all files within the NAS system and tamper with those files.

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Meta Information

Published
2026-02-03
Last Modified
2026-02-11
Generated
2026-07-06
AI Q&A
2026-02-04
EPSS Evaluated
2026-07-05
NVD
CVE-2025-69430

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
yottamaster dm2_firmware to 1.9.12 (inc)
yottamaster dm3_firmware to 1.9.12 (inc)
yottamaster dm200_firmware to 1.2.23 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-59 The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

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Executive Summary

This vulnerability is an Incorrect Symlink Follow issue found in multiple Yottamaster NAS devices, including DM2, DM3, and DM200 models with certain firmware versions. Attackers can exploit this by formatting a USB drive to ext4, creating a symbolic link to the root directory of the USB drive, and then inserting it into the NAS device. When the NAS mounts the USB drive, the attacker can access the symlink directory on the NAS, which allows them to view and tamper with all files within the NAS system.

Impact Analysis

This vulnerability can lead to unauthorized access and modification of the internal file system of the affected NAS devices. An attacker exploiting this flaw could leak sensitive data stored on the NAS or tamper with files, potentially causing data loss, corruption, or unauthorized disclosure of confidential information.

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