CVE-2024-53695
Published: 07 March 2025
Summary
CVE-2024-53695 is a critical-severity Classic Buffer Overflow (CWE-120) vulnerability in Qnap Hybrid Backup Sync. Its CVSS base score is 9.1 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 26.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-16 (Memory Protection) and SI-2 (Flaw Remediation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Requires timely identification, reporting, and correction of the buffer overflow flaw, enabling patching to HBS 3 version 25.1.4.952 or later.
Implements memory protections like ASLR and DEP to prevent successful exploitation of buffer overflows via arbitrary memory modification or code execution.
Enforces validation of network inputs to block oversized or malformed data that triggers the buffer overflow vulnerability.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote buffer overflow in public-facing backup sync service enables T1190 for initial exploitation; arbitrary memory modification facilitates T1565.001 data tampering; process crashes enable T1499.004 DoS via application exploitation.
NVD Description
A buffer overflow vulnerability has been reported to affect HBS 3 Hybrid Backup Sync. If exploited, the vulnerability could allow remote attackers to modify memory or crash processes. We have already fixed the vulnerability in the following version: HBS 3…
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Hybrid Backup Sync 25.1.4.952 and later
Deeper analysisAI
CVE-2024-53695 is a buffer overflow vulnerability (CWE-120, CWE-121) in HBS 3 Hybrid Backup Sync from QNAP, published on 2025-03-07. The flaw affects this backup synchronization software, earning a CVSS v3.1 base score of 9.1 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H), indicating critical severity due to its potential for high impact on integrity and availability without confidentiality compromise.
Remote attackers can exploit the vulnerability over the network with low attack complexity, requiring no privileges, authentication, or user interaction. Exploitation enables arbitrary memory modification, potentially leading to data tampering or process crashes, which could disrupt backup operations or enable further compromise depending on the attacker's goals.
QNAP has mitigated the issue in HBS 3 Hybrid Backup Sync version 25.1.4.952 and later. Administrators should update affected systems immediately, as detailed in the vendor's security advisory at https://www.qnap.com/en/security-advisory/qsa-25-06.
Details
- CWE(s)