CVE-2025-29876Network attack vector

Authenticated service interruption via NULL dereference

Published Jun 6, 2025 · Updated Jun 6, 2025

NULL pointer dereference in QNAP File Station 5 5.5.x before 5.5.6.4847 allows remote authenticated users to interrupt service. QNAP has not disclosed the affected request handler, crafted input, or operation that dereferences the NULL pointer. A valid user account and network access to File Station are required; no data disclosure or modification is reported.

CVSS severity5.3
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in QNAP File Station 5 5.5.x before 5.5.6.4847 allows remote authenticated users to interrupt service. QNAP has not disclosed the affected request handler, crafted input, or operation that dereferences the NULL pointer. A valid user account and network access to File Station are required; no data disclosure or modification is reported.

The record

CVE
CVE-2025-29876
Published
Jun 6, 2025
Updated
Jun 6, 2025
Vendor
Linn Products Limited
Product
File Station 5
Classifications
CWE-476, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 6, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.5.x <5.5.6.4847

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linn Products Limited · File Station 5version=5.5.x <5.5.6.4847

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3QNAP Systems, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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