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QNAP has issued an urgent warning regarding a critical vulnerability, CVE-2025-55315, affecting its NetBak PC Agent backup utility for Windows. The flaw, rooted in Microsoft’s ASP.NET Core framework and specifically the Kestrel server, enables attackers to exploit HTTP request smuggling techniques to bypass security controls, hijack credentials, and potentially access or modify sensitive backup data. The vulnerability, which carries a CVSS score of up to 9.9, requires attackers to have valid credentials but can result in unauthorized access, file modification, or limited denial-of-service conditions if exploited. QNAP’s advisory highlights that the NetBak PC Agent installs and relies on the vulnerable ASP.NET Core components, making any unpatched system susceptible to attack.
Security researchers and QNAP emphasize the importance of immediate remediation, recommending users either reinstall the NetBak PC Agent to ensure the latest ASP.NET Core runtime is deployed or manually update the ASP.NET Core components on affected systems. The vulnerability’s impact is heightened by the fact that backup servers, which often store critical data, are at risk if running outdated ASP.NET Core versions. QNAP strongly urges all users to verify their systems are up to date to prevent exploitation and safeguard backup integrity and data availability.
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QNAP and Microsoft published advisories warning users about CVE-2025-55315 and recommending immediate remediation. Users were told to reinstall NetBak PC Agent or manually update to the latest .NET 8.0 runtime bundle to address the issue.
A critical vulnerability, CVE-2025-55315, was disclosed in the ASP.NET Core/Kestrel component used by QNAP's NetBak PC Agent for Windows. The flaw was rated CVSS 9.9 and could allow authenticated attackers to conduct HTTP request smuggling, bypass security controls, steal credentials, access sensitive data, modify files, or cause denial of service.
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QNAP has addressed two high-severity security vulnerabilities affecting its NetBak Replicator and Qsync Central products. The first vulnerability, tracked as CVE-2025-53595, is an SQL injection flaw in Qsync Central. This vulnerability allows a remote attacker with a user account to execute unauthorized code or commands on the affected system. QNAP has released a fix for this issue in Qsync Central version 5.0.0.2 and later, mitigating the risk of exploitation. The second vulnerability, identified as CVE-2025-57714, impacts NetBak Replicator and is classified as an unquoted search path or element vulnerability. This flaw enables a local attacker with a user account to execute unauthorized code or commands, potentially leading to privilege escalation or further compromise of the system. The vulnerability in NetBak Replicator has been resolved in version 4.5.15.0807 and later. Both vulnerabilities have been assigned high CVSS scores, with the SQL injection in Qsync Central rated at 8.6 and the NetBak Replicator flaw at 8.5, reflecting their significant security impact. QNAP's security advisories recommend that users update to the latest versions of the affected products to ensure protection against these threats. The SQL injection vulnerability in Qsync Central is remotely exploitable, increasing its risk profile, while the NetBak Replicator issue requires local access. No specific details about exploitation in the wild have been reported, but the technical nature of the flaws underscores the importance of prompt patching. The vulnerabilities were reported to QNAP by security researchers and disclosed through official channels, including CVE databases and QNAP's own security team. The advisories do not list the exact affected product versions prior to the fixed releases, but users are urged to verify their software versions and apply updates as soon as possible. QNAP's response demonstrates a commitment to addressing security issues in a timely manner, with coordinated disclosure and clear communication to customers. Organizations using QNAP NetBak Replicator or Qsync Central should review their deployment, assess potential exposure, and implement the recommended updates. The vulnerabilities highlight the ongoing risk of both remote and local exploitation vectors in widely used backup and synchronization software. Security teams are advised to monitor for any signs of compromise and to follow best practices for user account management and software maintenance. The prompt release of patches and public disclosure of these vulnerabilities contribute to the overall security posture of QNAP's user base.
Jun 29, 2026
QNAP has addressed several security vulnerabilities affecting its License Center application and other NAS tools, which could allow attackers to access sensitive information or disrupt services on affected devices. The vulnerabilities, identified as CVE-2025-52871 (out-of-bounds read) and CVE-2025-53597 (buffer overflow), require an attacker to have access to a valid or administrator account, making credential theft or weak passwords a significant risk factor. QNAP has released patches in License Center 2.0.36 and later, urging organizations and home users to update immediately, especially if their NAS devices are accessible from the internet or shared among multiple users. In addition to the License Center flaws, QNAP also patched high-severity SQL injection and path traversal vulnerabilities in its NAS products. These vulnerabilities could have allowed attackers to execute arbitrary code or access restricted files, further emphasizing the importance of timely updates. Users are advised to access the QTS or QuTS hero management interface and apply the latest security updates to mitigate these risks and protect sensitive data stored on QNAP devices.
Jun 29, 2026
QNAP has patched 14 vulnerabilities across **QTS**, **QuTS hero**, **QuTS cloud**, and **QVP** that affect NAS and surveillance appliances, with impacts ranging from denial of service and information disclosure to privilege escalation and remote code execution. The vendor’s advisory `QSA-26-10` describes multiple bug classes, including command injection, buffer overflow, broken access control, URL injection, NULL pointer dereference, and uncontrolled resource consumption, and rates the issues as **Important**. The most serious flaws include command injection vulnerabilities `CVE-2025-66273`, `CVE-2025-66279`, and `CVE-2026-22893`, which can allow arbitrary command execution through username handling or administrative APIs, including one privilege-escalation scenario. QNAP also fixed `CVE-2025-59382`, a password-reset URL manipulation issue that can expose credentials. Fixed releases include **QVP 2.8.0**, **QuTS cloud C5.2.9**, **QTS 5.2.9.3499**, and **QuTS hero h5.2.9**; administrators were urged to update immediately, avoid exposing management interfaces to the internet, and maintain snapshots and offline backups because internet-facing NAS devices are frequent ransomware targets.
Jun 29, 2026