CVE-2025-6599

An uncontrolled resource consumption vulnerability in the web server of Zyxel DX3301-T0 firmware...

5.3 Medium

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: Low

Exploit likelihood

0.34%Up 0.3 points since Nov 18, 2025

What each source reports

CVE List Score used 5.3

Record: CVE-2025-6599
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-400
Updated: 2026-11-02

EUVDEUVD-2025-197903 5.3

Record: EUVD-2025-197903
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated: 2026-11-02

GitHub AdvisoriesGHSA-r99r-5wp8-8w99 5.3

An uncontrolled resource consumption vulnerability in the web server of Zyxel DX3301-T0 firmware...

Record: GHSA-r99r-5wp8-8w99
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-400
Updated: 2026-11-02

NVD 5.3

Record: CVE-2025-6599
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-400
Updated: 2026-11-02

Affected products

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History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-6599 is a medium vulnerability (CVSS 5.3) in Zyxel Dx3301-t0 Firmware, published November 18, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.34%, the 26th percentile. No source names a fixed version.