CVE-2024-53697: QNAP QuTS Hero Buffer Overflow Vulnerability

CVE-2024-53697 Overview

CVE-2024-53697 is an out-of-bounds write vulnerability affecting several QNAP operating system versions, including QTS and QuTS hero. Remote attackers who have already obtained administrator access can exploit the flaw to modify or corrupt memory. QNAP addressed the issue in QTS 5.2.3.3006 build 20250108 and QuTS hero h5.2.3.3006 build 20250108.

The weakness is tracked as [CWE-787]. Exploitation requires high privileges and high attack complexity, which limits the practical risk compared with unauthenticated memory corruption bugs. No public proof-of-concept is available, and CISA has not added the CVE to the Known Exploited Vulnerabilities catalog.

Critical Impact
Authenticated administrators can trigger out-of-bounds writes that corrupt memory on affected QNAP NAS devices.

Affected Products

QNAP QTS versions from 5.2.0.2737 through 5.2.2.2950 prior to 5.2.3.3006 build 20250108
QNAP QuTS hero versions from h5.2.0.2737 through h5.2.2.2952 prior to h5.2.3.3006 build 20250108
QNAP NAS appliances running the affected QTS and QuTS hero builds

Discovery Timeline

2025-03-07 - CVE-2024-53697 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-53697

Vulnerability Analysis

The vulnerability is an out-of-bounds write in QNAP QTS and QuTS hero operating systems. Out-of-bounds write conditions occur when software writes data past the end, or before the beginning, of an intended memory buffer. On affected QNAP appliances, an authenticated administrator can supply crafted input over the network that causes the operating system to write outside a valid memory region.

The write primitive can corrupt adjacent memory structures, potentially altering control data or triggering process instability. QNAP classifies the issue under [CWE-787]. Because the attack requires administrator privileges and high complexity, exploitation depends on either credential compromise or chaining with a lower-privilege bug.

Root Cause

The root cause is missing or insufficient bounds validation in a network-reachable QNAP OS component. When the vulnerable routine processes attacker-controlled input, an index or length value falls outside the allocated buffer boundary. The routine then writes to memory locations it should not access, corrupting heap or stack state.

Attack Vector

The attack vector is network-based. An attacker who has already gained administrator access on the NAS sends specially crafted requests to the affected service. The vulnerable code path performs the unsafe write, leading to memory modification or corruption. See the QNAP Security Advisory QSA-24-54 for vendor-provided technical details.

// No verified proof-of-concept code is available for CVE-2024-53697.
// Refer to QNAP Security Advisory QSA-24-54 for vendor guidance.

Detection Methods for CVE-2024-53697

Indicators of Compromise

Unexpected crashes, restarts, or watchdog resets of QTS or QuTS hero services following administrative sessions
Administrator logins from unfamiliar IP addresses or geolocations preceding NAS instability
Anomalous management API or web UI requests containing oversized or malformed parameters

Detection Strategies

Compare running firmware versions against the fixed builds QTS 5.2.3.3006 build 20250108 and QuTS hero h5.2.3.3006 build 20250108
Review QNAP system logs for repeated segmentation faults, kernel oops entries, or service restarts tied to admin activity
Correlate administrator authentication events with subsequent process crashes to surface potential exploitation attempts

Monitoring Recommendations

Restrict and monitor administrative access to QNAP appliances, alerting on new admin logins from external networks
Enable and forward QTS and QuTS hero system logs to a central logging or SIEM platform for retention and correlation
Track outbound connections from NAS devices to detect post-exploitation activity such as data staging or command-and-control traffic

How to Mitigate CVE-2024-53697

Immediate Actions Required

Upgrade QTS to 5.2.3.3006 build 20250108 or later
Upgrade QuTS hero to h5.2.3.3006 build 20250108 or later
Remove NAS management interfaces from direct internet exposure and place them behind a VPN
Rotate administrator credentials and enforce multi-factor authentication on all admin accounts

Patch Information

QNAP fixed the vulnerability in QTS 5.2.3.3006 build 20250108 and later, and in QuTS hero h5.2.3.3006 build 20250108 and later. Administrators should apply the updates through the QTS Control Panel firmware update workflow or download the images directly from the QNAP support portal. Full remediation guidance is documented in QNAP Security Advisory QSA-24-54.

Workarounds

Limit administrator access to trusted management networks using firewall rules and QTS access controls
Disable unused network services and management protocols on the NAS to reduce reachable attack surface
Enforce strong, unique administrator passwords and enable account lockout policies to slow credential-based attacks

bash

# Verify current QTS or QuTS hero version before and after patching
getcfg System Version
getcfg System "Build Number"