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Low severity · published Oct 15, 2026
CVE-2025-29897
Stack-based Buffer Overflow in qsyncsrv.cgi
2.3
CVSS
0.3%
EPSS
No
On KEV
Description
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
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
QC
Qsync Central · QNAP Systems Inc.
5.0.x before 5.0.0.4 · source: vendor
Affected product
QC
Qsync Central
QNAP Systems Inc.
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-29897
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-29897
www.qnap.com
https://www.qnap.com/en/app-release-notes?keyword=Qsync%20&app=QsyncServer&product-line=nas
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