CVE-2025-62858
Received Received - Intake
Buffer Overflow in QNAP QTS and QuTS hero

Publication date: 2026-06-09

Last updated on: 2026-06-09

Assigner: QNAP Systems, Inc.

Description
A buffer overflow vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to modify memory or crash processes. We have already fixed the vulnerability in the following versions: QTS 5.2.9.3410 build 20260214 and later QuTS hero h5.2.9.3410 build 20260214 and later QuTS hero h5.3.4.3500 build 20260520 and later QuTS hero h6.0.0.3397 build 20260206 and later
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-06-09
Last Modified
2026-06-09
Generated
2026-06-09
AI Q&A
2026-06-09
EPSS Evaluated
N/A
NVD
EUVD
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
qnap qts From 5.2.9.3410 (inc)
qnap quts_hero From h5.2.9.3410 (inc)
qnap quts_hero From h5.3.4.3500 (inc)
qnap quts_hero From h6.0.0.3397 (inc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability is a buffer overflow issue affecting several versions of QNAP operating systems. It allows a remote attacker who has already obtained an administrator account to exploit the vulnerability to modify memory or cause processes to crash.

Impact Analysis

If exploited, this vulnerability can allow an attacker with administrator access to alter memory contents or crash system processes, potentially leading to system instability, denial of service, or unauthorized manipulation of system behavior.

Mitigation Strategies

To mitigate this vulnerability, you should update your QNAP operating system to one of the fixed versions listed below:

  • QTS 5.2.9.3410 build 20260214 or later
  • QuTS hero h5.2.9.3410 build 20260214 or later
  • QuTS hero h5.3.4.3500 build 20260520 or later
  • QuTS hero h6.0.0.3397 build 20260206 or later

Since the vulnerability requires an attacker to have an administrator account, ensure that administrator credentials are secure and monitor for any unauthorized access.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2025-62858. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart