Secret disclosure or memory modification via format strings
Published Jan 2, 2026 · Updated Jan 2, 2026
Format string injection in QNAP QTS 5.2.x and QuTS hero h5.2.x and h5.3.x allows remote authenticated users to disclose secrets or modify memory. QNAP has not disclosed the affected component, attacker-controlled field, or formatting operation that consumes the input. Exploitation requires a remote attacker to control an administrator account; the published impact is limited to secret disclosure or memory modification.
Summary
What happened
Format string injection in QNAP QTS 5.2.x and QuTS hero h5.2.x and h5.3.x allows remote authenticated users to disclose secrets or modify memory. QNAP has not disclosed the affected component, attacker-controlled field, or formatting operation that consumes the input. Exploitation requires a remote attacker to control an administrator account; the published impact is limited to secret disclosure or memory modification.
The record
- CVE
- CVE-2025-53591
- Published
- Jan 2, 2026
- Updated
- Jan 2, 2026
- Vendor
- Linn Products Limited
- Product
- QuTS hero
- Classifications
- CWE-134
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Jan 2, 2026CVE publishedPublication date reported by the CVE source.
- Jan 2, 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.x <h5.2.7.3256 build 20250913
- Affected versionversion=h5.3.x <h5.3.1.3250 build 20250912
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.
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Technologies
Your stack
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Your stack
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