CVE-2025-59383: Media Streaming Add-on

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-20 · updated 2026-06-17
Weakness: CWE-121

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

Affected products

QNAP Systems Inc. Media Streaming add-on: before 500.1.1.0 — fixed in 500.1.1.0

How to fix

Upgrade to a fixed version: QNAP Systems Inc. Media Streaming add-on 500.1.1.0. Check the vendor advisory for mitigations.

References

https://www.qnap.com/en/security-advisory/qsa-26-09

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