Advisory Details

July 31st, 2025

(Pwn2Own) QNAP QHora-322 qsyslog-cli username Format String Remote Code Execution Vulnerability

CVE ID
CVSS SCORE	7.5, AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	QNAP
AFFECTED PRODUCTS	QHora-322
VULNERABILITY DETAILS	This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of QNAP QHora-322 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the username parameter provided to the qsyslog-cli executable. The issue results from the lack of proper validation of a user-supplied string before using it as a format specifier. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of root.
ADDITIONAL DETAILS	QNAP has issued an update to correct this vulnerability. More details can be found at: https://www.qnap.com/en-us/security-advisories
DISCLOSURE TIMELINE	2024-12-02 - Vulnerability reported to vendor 2025-07-31 - Coordinated public release of advisory 2025-07-31 - Advisory Updated
CREDIT	Chris Anastasio @mufinnnnnnn & Fabius Watson

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