Cyber Resilience

CVE-2025-53407

Qnap Qts 5.2.0.2737 … 5.2.5.3145

Published
03 October 2025
Modified
08 October 2025
Patch / advisory
View advisory
CVSS Score v4 5.1
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0034 26th percentile
Risk Priority 35 floored blend · peak EPSS

Summary

CVE-2025-53407 is a medium-severity Use of Externally-Controlled Format String (CWE-134) vulnerability in Qnap Qts. Its CVSS base score is 5.1 (Medium).

Operationally, ranked at the 26th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SI-10 (Information Input Validation) and SI-16 (Memory Protection) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

A use of externally-controlled format string 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 or modify memory. We have…

more

already fixed the vulnerability in the following versions: QTS 5.2.6.3195 build 20250715 and later QuTS hero h5.2.6.3195 build 20250715 and later

CWE(s)
CWE-134

Related Threats

CVEs Like This One

CVE-2024-50402Same product: Qnap Qts
CVE-2025-53591Same product: Qnap Qts
CVE-2024-50403Same product: Qnap Qts
CVE-2024-50396Same product: Qnap Qts
CVE-2024-50398Same product: Qnap Qts
CVE-2024-50400Same product: Qnap Qts
CVE-2025-52429Same product: Qnap Qts
CVE-2024-50401Same product: Qnap Qts
CVE-2025-48730Same product: Qnap Qts
CVE-2025-53406Same product: Qnap Qts

Affected Assets

qnap
qts
5.2.0.2737, 5.2.0.2744, 5.2.0.2782, 5.2.0.2802, 5.2.0.2823
qnap
quts hero
h5.2.0.2737, h5.2.0.2782, h5.2.0.2789, h5.2.0.2802, h5.2.0.2823

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
  • SI-10 Information Input Validation
  • SI-16 Memory Protection
  • AC-6 Least Privilege
Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Directly blocks externally-controlled format strings by validating all untrusted input before it reaches string-formatting functions.

SI-16 Memory Protection good match
prevent

Enforces memory-protection mechanisms that stop the arbitrary memory reads/writes that result from a successful format-string exploit.

AC-6 Least Privilege partial match
prevent

Limits the scope of damage an attacker can cause once an administrator account is obtained, reducing the impact of the memory or secret-data exposure.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly prevent external format strings via code review, static analysis, and safe APIs.

ID.RA-01 partial match
prevents

Vulnerability identification can discover existing format-string flaws but does not prevent their introduction.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
detects

Security testing in development can detect format-string vulnerabilities before release.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC mandates input validation and safe API usage that can prevent externally-controlled format strings.

A.8.26 Application security requirements partial match
prevents

Application security requirements can specify safe formatting functions and ban uncontrolled format strings.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles discourage dangerous string-handling patterns that lead to format-string issues.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly forbid the use of untrusted format strings and prescribe safe alternatives.

References