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Vulnerabilities

Vulnerability · CVE-2025-66280

An integer overflow or wraparound vulnerability has been reported to affect several QNAP operating system versions.

Published Jun 10, 2026 · catalog updated Jul 23, 2026 · An integer overflow or

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-66280. EPSS is 0.44%. Act only if a listed version of An integer overflow or is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (An integer overflow or).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.44%
Remediation
Version ranges on file
Affected products
cpe qnap/qts · cpe qnap/quts hero

An integer overflow or wraparound 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 compromise the security of the system. 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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe qnap/qts< 5.2.9.3410
  • cpe qnap/quts hero< h5.2.9.3410
  • cpe qnap/quts hero< h5.3.4.3500
  • cpe qnap/quts hero< h6.0.0.3397

How to fix CVE-2025-66280

  • Upgrade

    CVE-2025-66280 lists a fix boundary at 5.2.9.3410. Compare the installed build with that boundary before you change production.

  • Version check

    Affected < 5.2.9.3410

  • Advisory

    Open the inventory_high record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-66280. EPSS is 0.44%. Act only if a listed version of An integer overflow or is installed.

Which versions are affected?

Compare what you have installed with qnap/quts hero < h5.2.9.3410; qnap/quts hero < h5.3.4.3500; qnap/quts hero < h6.0.0.3397. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-121: Stack-based Buffer Overflow; CWE-190: Integer Overflow. EPSS 0.44%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

QNAP QTS security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 10, 2026 · Monitored products — high

    Detected

    An integer overflow or wraparound 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 compromise the security of the system. 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 l

  2. Jul 23, 2026 · Monitored products — high

    Updated

    An integer overflow or wraparound 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 compromise the security of the system. 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 l

Sources

  • Monitored products — highVendor advisoryCVE-2025-66280

    An integer overflow or wraparound 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 compromise the security of the system. 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 l

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Monitored products — highNov 6, 2026