Medium severity · published Oct 3, 2025
CVE-2025-33040
An allocation of resources without limits or throttling vulnerability has been reported to affect Qsync Central
6.5
CVSS
0.4%
EPSS
No
On KEV
Description
An allocation of resources without limits or throttling vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to prevent other systems, applications, or processes from accessing the same type of resource.
We have already fixed the vulnerability in the following version:
Qsync Central 5.0.0.1 ( 2025/07/09 ) and later
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 31% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
QC
Qsync Central · Qnap
4.2.0.0 before 5.0.0.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-33040
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-33040
Vendor Advisory
https://www.qnap.com/en/security-advisory/qsa-25-34
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