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Vulnerabilities

Vulnerability · CVE-2025-30273

An out-of-bounds write vulnerability has been reported to affect several QNAP operating system versions.

Published Aug 29, 2025 · catalog updated Aug 29, 2025 · QNAP Systems Inc. QTS

Last checked Oct 26, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-30273. EPSS is 0.38%. Act only if a listed version of QNAP Systems Inc. QTS is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.38%
Remediation
Version ranges on file
Affected products
vendor QNAP Systems Inc. QTS 5.2.x <5.2.5.3145 build 20250526

An out-of-bounds write vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains a user account, they can then exploit the vulnerability to modify or corrupt memory. We have already fixed the vulnerability in the following versions: QTS 5.2.5.3145 build 20250526 and later QuTS hero h5.2.5.3138 build 20250519 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.

  • vendor QNAP Systems Inc. QTS 5.2.x <5.2.5.3145 build 202505265.2.x <5.2.5.3145 build 20250526

How to fix CVE-2025-30273

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-2025-30273. EPSS is 0.38%. Act only if a listed version of QNAP Systems Inc. QTS is installed.

Which versions are affected?

Compare what you have installed with QNAP Systems Inc. QTS 5.2.x <5.2.5.3145 build 20250526 5.2.x <5.2.5.3145 build 20250526. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.38%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

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. Aug 29, 2025 · EUVD

    Detected

    An out-of-bounds write vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains a user account, they can then exploit the vulnerability to modify or corrupt memory. We have already fixed the vulnerability in the following versions: QTS 5.2.5.3145 build 20250526 and later QuTS hero h5.2.5.3138 build 20250519 and later

  2. Aug 29, 2025 · EUVD

    Updated

    An out-of-bounds write vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains a user account, they can then exploit the vulnerability to modify or corrupt memory. We have already fixed the vulnerability in the following versions: QTS 5.2.5.3145 build 20250526 and later QuTS hero h5.2.5.3138 build 20250519 and later

Sources

  • CVE.orgVulnerability recordCVE-2025-30273

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-30273

    30-day exploitation probability 0.38%

    first.org
  • EUVDVulnerability recordEUVD-2025-27787

    An out-of-bounds write vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains a user account, they can then exploit the vulnerability to modify or corrupt memory. We have already fixed the vulnerability in the following versio

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 22, 2026
  • EUVDOct 22, 2026