CVE-2025-62849: QNAP QTS SQL Injection Vulnerability

CVE-2025-62849 Overview

An SQL injection vulnerability has been identified in QNAP QTS and QuTS hero operating systems that allows remote attackers to execute unauthorized code or commands. This vulnerability affects multiple versions of QNAP's NAS operating systems and poses a significant risk to organizations using affected QNAP devices for data storage and network services.

SQL injection vulnerabilities in NAS devices are particularly concerning as these systems often store sensitive business and personal data. Successful exploitation could allow attackers to manipulate database queries, potentially leading to data theft, unauthorized access, or execution of malicious commands on the underlying system.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to execute unauthorized code or commands on affected QNAP NAS devices, potentially compromising stored data and system integrity.

Affected Products

• QNAP QTS versions prior to 5.2.7.3297 build 20251024
• QNAP QuTS hero versions prior to h5.2.7.3297 build 20251024
• QNAP QuTS hero versions prior to h5.3.1.3292 build 20251024

Discovery Timeline

• December 16, 2025 - CVE-2025-62849 published to NVD
• December 17, 2025 - Last updated in NVD database

Technical Details for CVE-2025-62849

Vulnerability Analysis

This vulnerability is classified as CWE-89 (Improper Neutralization of Special Elements used in an SQL Command), commonly known as SQL Injection. The flaw exists in components of the QNAP operating system that process user-supplied input without adequate sanitization before incorporating it into SQL queries.

When user input is directly concatenated into SQL statements without proper validation or parameterization, attackers can inject malicious SQL code that alters the intended query logic. In the context of QNAP NAS devices, this could provide attackers with the ability to bypass authentication mechanisms, extract sensitive data from the database, modify or delete stored information, or potentially achieve code execution on the underlying system.

The network-accessible nature of this vulnerability means that any QNAP device exposed to a network (including the internet) could be targeted. While the attack requires some level of user interaction, successful exploitation could lead to complete compromise of data confidentiality, integrity, and availability on the affected device.

Root Cause

The root cause of CVE-2025-62849 lies in improper input validation and the lack of parameterized queries in the affected QNAP software components. When SQL queries are constructed by directly incorporating user-supplied data without proper escaping or using prepared statements, malicious actors can inject arbitrary SQL syntax that gets executed by the database engine.

This type of vulnerability typically occurs when developers use string concatenation to build SQL queries rather than utilizing secure coding practices such as prepared statements with bound parameters, which separate SQL code from user data.

Attack Vector

The attack is network-based, allowing remote exploitation without requiring prior authentication to the target system. An attacker would craft specially formatted input containing SQL syntax and submit it to a vulnerable endpoint on the QNAP device. When the application processes this input and includes it in a database query, the injected SQL commands are executed.

Depending on the specific vulnerable component and database permissions, successful exploitation could enable attackers to:

• Query and exfiltrate sensitive data stored in the NAS database
• Modify or delete database records
• Bypass authentication controls
• Execute stored procedures or extended functionality that could lead to operating system command execution

The vulnerability requires user interaction according to the CVSS vector, suggesting that the attack may involve a user clicking a malicious link or visiting a compromised page that submits the malicious payload to the vulnerable QNAP device.

Detection Methods for CVE-2025-62849

Indicators of Compromise

• Unusual database query patterns or errors in QNAP system logs indicating malformed SQL statements
• Unexpected authentication events or access to restricted resources without proper credentials
• Database modification timestamps that don't correspond to legitimate administrative activities
• Network traffic containing SQL injection payloads targeting QNAP device management interfaces

Detection Strategies

• Deploy web application firewalls (WAF) configured to detect and block common SQL injection attack patterns
• Monitor QNAP device logs for SQL syntax errors, database exceptions, or unusual query execution times
• Implement network intrusion detection systems (IDS) with signatures for SQL injection attacks against QNAP products
• Review authentication logs for anomalous successful logins or privilege escalation events

Monitoring Recommendations

• Enable verbose logging on QNAP devices to capture detailed request information for forensic analysis
• Configure alerting for multiple failed authentication attempts followed by successful access
• Monitor outbound network connections from QNAP devices for potential data exfiltration activities
• Implement file integrity monitoring on critical QNAP system files and configurations

How to Mitigate CVE-2025-62849

Immediate Actions Required

• Update affected QNAP QTS devices to version 5.2.7.3297 build 20251024 or later immediately
• Update affected QuTS hero devices to version h5.2.7.3297 build 20251024 or h5.3.1.3292 build 20251024 or later
• Restrict network access to QNAP management interfaces using firewall rules until patches are applied
• Review access logs for any signs of exploitation attempts prior to patching

Patch Information

QNAP has released security updates addressing this vulnerability. Administrators should apply the following fixed versions:

• QTS: Version 5.2.7.3297 build 20251024 and later
• QuTS hero: Version h5.2.7.3297 build 20251024 and later
• QuTS hero: Version h5.3.1.3292 build 20251024 and later

For detailed patch information and download instructions, refer to the QNAP Security Advisory QSA-25-45.

Workarounds

• Disable remote access to QNAP devices until patches can be applied, limiting exposure to the vulnerability
• Implement network segmentation to isolate NAS devices from untrusted networks and limit potential attack surface
• Configure firewall rules to restrict access to QNAP management interfaces to trusted IP addresses only
• Enable two-factor authentication on QNAP devices as an additional layer of defense against unauthorized access

# Example: Restrict QNAP management access to specific IP ranges using iptables
# Run on firewall or router protecting the QNAP device

# Allow management access only from trusted admin network
iptables -A INPUT -p tcp --dport 8080 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 192.168.1.0/24 -j ACCEPT

# Block all other access to management ports
iptables -A INPUT -p tcp --dport 8080 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP