Critical severity · published Mar 20, 2026
CVE-2025-59383
A buffer overflow vulnerability has been reported to affect Media Streaming Add-On
9.1
CVSS
0.3%
EPSS
No
On KEV
Description
A buffer overflow vulnerability has been reported to affect Media Streaming Add-On. The remote attackers can then exploit the vulnerability to modify memory or crash processes.
We have already fixed the vulnerability in the following version:
Media Streaming Add-on 500.1.1 and later
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MS
Media Streaming Add-on · Qnap
before 500.1.1.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-59383
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-59383
Vendor Advisory
https://www.qnap.com/en/security-advisory/qsa-26-09
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