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VulnerabilityPublished

CVE-2025-54164: QNAP Systems QTS · Out-of-bounds Read

Affects QNAP Systems QTSSource CVE Database V5

0

Not known to be exploited · CVSS 4.6 Medium : upgrade to 5.2.7.3256 build 20250913 when convenient.

Data as of 26 Oct 2026, 13:47 UTC

CVSS 4.0 base score
4.6Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 27% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 5.2.7.3256 build 20250913, h5.3.1.3250 build 20250912, h5.2.7.3256 build 20250913
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 2 Jan 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade QTS to 5.2.7.3256 build 20250913; QuTS hero to h5.3.1.3250 build 20250912 or h5.2.7.3256 build 20250913.

Affected software

ProductAffectedFixed in
QNAP Systems Inc.QTSAffected
  • =>=5.2.0 <5.3.0
Fixed in
  • 5.2.7.3256 build 20250913
QNAP Systems Inc.QuTS heroAffected
  • ≥ h5.2.x, < h5.2.7.3256 build 20250913
  • ≥ h5.3.x, < h5.3.1.3250 build 20250912
Fixed in
  • h5.3.1.3250 build 20250912
  • h5.2.7.3256 build 20250913

AI-suggested

  1. Immediately upgrade all QNAP QTS devices to the fixed versions: QTS 5.2.7.3256 build 20250913 or later, or QuTS hero h5.2.7.3256 build 20250913 and h5.3.1.3250 or later.
  2. Enforce strict administrator account management: use strong, unique passwords, enable multi-factor authentication (MFA), and limit administrator access to trusted personnel only.
  3. Regularly audit administrator account activity and access logs to detect suspicious behavior.
  4. Network segmentation: isolate NAS devices from general network access and restrict management interfaces to trusted IP addresses or VPN access only.
  5. Implement intrusion detection/prevention systems (IDS/IPS) to monitor for anomalous access patterns.
  6. Educate users and administrators about phishing and credential theft risks to prevent initial compromise of admin accounts.
  7. Maintain up-to-date backups of critical data to mitigate potential data loss scenarios.

Description

An out-of-bounds read 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 obtain secret data. We have already fixed the vulnerability in the following versions: QTS 5.2.7.3256 build 20250913 and later QuTS hero h5.2.7.3256 build 20250913 and later QuTS hero h5.3.1.3250 build 20250912 and later

References

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