Advisory Details

March 30th, 2026

(Pwn2Own) QNAP QHora-322 ip6_wanifset Improper Restriction of Communication Channel to Intended Endpoints Firewall Bypass Vulnerability

CVE ID	CVE-2025-62843
CVSS SCORE	6.3, AV:A/AC:L/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 match IPv6 firewall rules on PPPoE connections. 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/security-advisory/qsa-26-12
DISCLOSURE TIMELINE	2025-11-18 - Vulnerability reported to vendor 2026-03-30 - Coordinated public release of advisory 2026-03-30 - Advisory Updated
CREDIT	Bongeun Koo (@kiddo_pwn) and Evangelos Daravigkas (@freddo_1337) of Team DDOS

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