CVE-2025-53598

Analyzed Analyzed - Analysis Complete

NULL Pointer Dereference in Qsync Central Enables Remote DoS

Publication date: 2026-02-11

Last updated on: 2026-02-12

Assigner: QNAP Systems, Inc.

Description

A NULL pointer dereference vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack. We have already fixed the vulnerability in the following version: Qsync Central 5.0.0.4 ( 2026/01/20 ) and later

CVSS Scores

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Meta Information

Published

2026-02-11

Last Modified

2026-02-12

Generated

2026-07-06

AI Q&A

2026-02-11

EPSS Evaluated

2026-07-05

NVD

CVE-2025-53598

Affected Vendors & Products

Vendor	Product	Version / Range
qnap	qsync_central	From 5.0.0.0 (inc) to 5.0.0.4 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-476	The product dereferences a pointer that it expects to be valid but is NULL.

Attack-Flow Graph

Executive Summary

This vulnerability is a NULL pointer dereference issue affecting Qsync Central. It occurs when a remote attacker who has gained access to a user account exploits this flaw to cause the application to crash or become unavailable.

Essentially, the attacker can trigger a denial-of-service (DoS) attack by exploiting this vulnerability.

Impact Analysis

If exploited, this vulnerability can lead to a denial-of-service (DoS) condition, making the Qsync Central service unavailable or unstable.

This means legitimate users may be unable to access or use the service while the attack is ongoing.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, you should upgrade Qsync Central to version 5.0.0.4 or later, as the vulnerability has been fixed starting from this version.

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