CVE-2025-6599

State: Published
Severity: 5.3 Medium
Published: Nov 18, 2025
Updated: Nov 18, 2025
Reserved: Jun 25, 2025

Description

An uncontrolled resource consumption vulnerability in the web server of Zyxel DX3301-T0 firmware version 5.50(ABVY.6.3)C0 and earlier could allow an attacker to perform Slowloris‑style denial‑of‑service (DoS) attacks. Such attacks may temporarily block legitimate HTTP requests and partially disrupt access to the web management interface, while other networking services remain unaffected.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	Zyxel

Weaknesses

CWE-400 Uncontrolled Resource Consumption

Affected Products

Product	Versions
DX3301-T0 firmwareZyxel	<= 5.50(ABVY.6.3)C0Affected

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-uncontrolled-resource-consumption-and-command-injection-vulnerabilities-in-certain-4g-lte-5g-nr-cpe-dsl-ethernet-cpe-fiber-onts-security-routers-and-wireless-extenders-11-18-2025vendor-advisory

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