CVE-2025-30269 | BDVDB-2026-314955 Detail

QNAP SystemsQsync Central

Description#

A use of externally-controlled format string vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to obtain secret data or modify memory. We have already fixed the vulnerability in the following version: Qsync Central 5.0.0.4 ( 2026/01/20 ) and later

Impact#

CAPEC-135

Weaknesses#

CWE-134 Use of Externally-Controlled Format String

References#

https://www.qnap.com/en/security-advisory/qsa-26-02

Exploit#

No public exploit known

History#

Version 12026-02-11Record published in the CVE List.

Published

Published: 2026-02-11
Last modified: 2026-02-11

Vendor information

Vendor: QNAP Systems
Product: Qsync Central

All QNAP Systems vulnerabilities

Score

0.6 Low

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 26.7.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Format String

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 5.0.x.x and < 5.0.0.4 ( 2026/01/20 )
Fixed
5.0.0.4 ( 2026/01/20 )

Scoring System

CVSS v4.0

0.6 Low

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	Present
Privileges Required	Low
User Interaction	None
Vulnerable System Confidentiality	None
Vulnerable System Integrity	None
Vulnerable System Availability	Low
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).