CVE-2025-29897 PUBLISHED

Stack-based Buffer Overflow in qsyncsrv.cgi

Assigner: qnap
Reserved: 12.03.2025 Published: 15.10.2026 Updated: 15.10.2026

A buffer copy without checking size of input vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to modify memory or crash processes.

We have already fixed the vulnerability in the following version: Qsync Central 5.0.0.4 and later

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 2.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	Low	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	QNAP Systems Inc.
Product	Qsync Central
Versions	Default: unaffected affected from 5.0.x to 5.0.0.4 (excl.)

Solutions

We have already fixed the vulnerability in the following version: Qsync Central 5.0.0.4 and later

Credits

web_hacker finder

References

https://www.qnap.com/en/app-release-notes?keyword=Qsync%20&app=QsyncServer&product-line=nas

Problem Types

CWE-120 CWE
CWE-121 CWE

Impacts

CAPEC-100