(Pwn2Own) QNAP QHora-322 qfirewall Improper Restriction of Communication Channel to Intended Endpoints Firewall Bypass Vulnerability

July 31st, 2025
ZDI-25-749 ZDI-CAN-25596

CVE ID

CVSS Score

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

Affected Vendors

QNAP

Affected Products

QHora-322

Vulnerability Details

This vulnerability allows network-adjacent attackers to bypass firewall rules on affected installations of QNAP QHora-322 routers. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the implementation of firewall rules. The issue results from failing to bind LAN IP ranges to the LAN interfaces. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary 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

Alain Rodel, Benjamin Walny (Neodyme AG)

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