How severe is CVE-2025-59383?

CVE-2025-59383 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2025-59383 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-59383?

CVE-2025-59383 affects Qnap Media Streaming Add-on. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-59383?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-59383 have an EU (EUVD) identifier?

Yes. CVE-2025-59383 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-208893.

When was CVE-2025-59383 published?

CVE-2025-59383 was published on 2026-03-20 and last updated on 2026-06-17.

CVE-2025-59383

CVE-2025-59383 is a critical-severity vulnerability in Qnap Media Streaming Add-on with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-121.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v4: 2.7
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-208893
Weakness: CWE-121
Affected product: Qnap Media Streaming Add-on
Published: 2026-03-20
Last modified: 2026-06-17

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

Frequently asked questions

What is CVE-2025-59383?: 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
How severe is CVE-2025-59383?: CVE-2025-59383 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2025-59383 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-59383?: CVE-2025-59383 affects Qnap Media Streaming Add-on. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-59383?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-59383 have an EU (EUVD) identifier?: Yes. CVE-2025-59383 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-208893.
When was CVE-2025-59383 published?: CVE-2025-59383 was published on 2026-03-20 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:qnap:media_streaming_add-on:*:*:*:*:*:*:*:*

More vulnerabilities in Qnap Media Streaming Add-on

CVE-2020-36195 — Critical (CVSS 9.8): An SQL injection vulnerability has been reported to affect QNAP NAS running Multimedia Console or the Media Streaming…
CVE-2017-7640 — Critical (CVSS 9.8): QNAP NAS application Media Streaming add-on version 421.1.0.2, 430.1.2.0, and earlier allows remote attackers to run…
CVE-2023-47222 — Critical (CVSS 9.6): An exposure of sensitive information vulnerability has been reported to affect Media Streaming add-on. If exploited,…
CVE-2023-23369 — Critical (CVSS 9.0): An OS command injection vulnerability has been reported to affect several QNAP operating system versions. If exploited,…
CVE-2024-50395 — High (CVSS 8.8): An authorization bypass through user-controlled key vulnerability has been reported to affect Media Streaming add-on.…
CVE-2017-7641 — High (CVSS 8.8): QNAP NAS application Media Streaming add-on version 421.1.0.2, 430.1.2.0, and earlier does not utilize CSRF protections.

All CVEs affecting Qnap Media Streaming Add-on →

Other CWE-121 (Stack-based Buffer Overflow) vulnerabilities

CVE-2026-12848 — Critical (CVSS 10.0): GV-I/O Box 4E is a smart embedded device with 4 input and 4 relays output that can be controlled over Ethernet and…
CVE-2026-12847 — Critical (CVSS 10.0): GV-I/O Box 4E is a smart embedded device with 4 input and 4 relays output that can be controlled over Ethernet and…
CVE-2026-12846 — Critical (CVSS 10.0): GV-I/O Box 4E is a smart embedded device with 4 input and 4 relays output that can be controlled over Ethernet and…
CVE-2026-12485 — Critical (CVSS 10.0): GV-I/O Box 4E is a smart embedded device with 4 input and 4 relays output that can be controlled over Ethernet and…
CVE-2026-37541 — Critical (CVSS 10.0): Buffer overflow vulnerability in Open Vehicle Monitoring System 3 (OVMS3) 3.3.005. In canformat_gvret.cpp, the length…
CVE-2026-42996 — Critical (CVSS 10.0): JS8Call through 2.3.1 and JS8Call-improved before 3.0 have a stack-based buffer overflow via a radio transmission of…

Browse all CWE-121 (Stack-based Buffer Overflow) vulnerabilities →