(Pwn2Own) QNAP QHora-322 access_setting HTTP Request Smuggling Vulnerability

July 31st, 2025
ZDI-25-736 ZDI-CAN-25632

CVE ID

CVSS Score

6.3 AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

Affected Vendors

QNAP

Affected Products

QHora-322

Vulnerability Details

This vulnerability allows network-adjacent attackers to smuggle arbitrary HTTP requests on affected installations of QNAP QHora-322 routers. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed.

The specific flaw exists within the access_setting endpoint. The issue results from the inconsistent parsing of terminators of HTTP headers. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the device.

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

Sina Kheirkhah (@SinSinology) of Summoning Team (@SummoningTeam)

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