Administrator-level service interruption via stack manipulation
Published Jun 10, 2026 · Updated Jun 10, 2026
Stack manipulation in QNAP QTS and QuTS hero allows remote authenticated users with administrator access to cause a service interruption. QNAP classifies the defect as integer overflow and stack-based buffer overflow, but has not disclosed the affected component, input field, or malformed value that triggers the stack manipulation. Exploitation requires an administrator account, and the disclosed consequences are unexpected system behavior or a denial-of-service condition rather than confidentiality loss.
Summary
What happened
Stack manipulation in QNAP QTS and QuTS hero allows remote authenticated users with administrator access to cause a service interruption. QNAP classifies the defect as integer overflow and stack-based buffer overflow, but has not disclosed the affected component, input field, or malformed value that triggers the stack manipulation. Exploitation requires an administrator account, and the disclosed consequences are unexpected system behavior or a denial-of-service condition rather than confidentiality loss.
The record
- CVE
- CVE-2025-66280
- Published
- Jun 10, 2026
- Updated
- Jun 10, 2026
- Vendor
- Linn Products Limited
- Product
- QuTS hero
- Classifications
- CWE-190, CWE-121, T1499.004
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Jun 10, 2026CVE publishedPublication date reported by the CVE source.
- Jun 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=h5.2.0 <h5.2.9.3410 build 20260214
- Affected versionversion=h5.3.0 <h5.3.4.3500 build 20260520
- Affected versionversion=? <h6.0.0.3397 build 20260206
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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