CVE-2025-6599

Summary

CVE	CVE-2025-6599
State	PUBLISHED
Assigner	Zyxel
Source Priority	CVE Program / NVD first with legacy fallback
Published	2025-11-18 02:15:45 UTC
Updated	2026-10-18 20:10:00 UTC
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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-400 | CWE-400 CWE-400 Uncontrolled Resource Consumption

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Primary	7.5	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
3.1	[email protected]	Secondary	5.3	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`
3.1	CNA	CVSS	5.3	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`

CVSS v3.1 Breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Hardware	Zyxel	Dm4200-b0	-	All	All	All
Operating System	Zyxel	Dm4200-b0 Firmware	All	All	All	All
Hardware	Zyxel	Dx3300-t0	-	All	All	All
Operating System	Zyxel	Dx3300-t0 Firmware	All	All	All	All
Hardware	Zyxel	Dx3300-t1	-	All	All	All
Operating System	Zyxel	Dx3300-t1 Firmware	All	All	All	All
Hardware	Zyxel	Dx3301-t0	-	All	All	All
Operating System	Zyxel	Dx3301-t0 Firmware	All	All	All	All
Hardware	Zyxel	Dx4510-b1	-	All	All	All
Operating System	Zyxel	Dx4510-b1 Firmware	All	All	All	All
Hardware	Zyxel	Dx5401-b0	-	All	All	All
Operating System	Zyxel	Dx5401-b0 Firmware	All	All	All	All
Hardware	Zyxel	Dx5401-b1	-	All	All	All
Operating System	Zyxel	Dx5401-b1 Firmware	All	All	All	All
Hardware	Zyxel	Ee3301-00	-	All	All	All
Operating System	Zyxel	Ee3301-00 Firmware	All	All	All	All
Hardware	Zyxel	Ee5301-00	-	All	All	All
Operating System	Zyxel	Ee5301-00 Firmware	All	All	All	All
Hardware	Zyxel	Ee6510-10	-	All	All	All
Operating System	Zyxel	Ee6510-10 Firmware	All	All	All	All
Hardware	Zyxel	Ex3300-t0	-	All	All	All
Operating System	Zyxel	Ex3300-t0 Firmware	All	All	All	All
Operating System	Zyxel	Ex3300-t0 Firmware	All	All	All	All
Hardware	Zyxel	Lte3301-plus	-	All	All	All
Operating System	Zyxel	Lte3301-plus Firmware	All	All	All	All
Hardware	Zyxel	Nebula Fwa505	-	All	All	All
Operating System	Zyxel	Nebula Fwa505 Firmware	All	All	All	All
Hardware	Zyxel	Nebula Fwa510	-	All	All	All
Operating System	Zyxel	Nebula Fwa510 Firmware	All	All	All	All
Hardware	Zyxel	Nebula Fwa515	-	All	All	All
Operating System	Zyxel	Nebula Fwa515 Firmware	All	All	All	All
Hardware	Zyxel	Nebula Fwa710	-	All	All	All
Operating System	Zyxel	Nebula Fwa710 Firmware	All	All	All	All
Hardware	Zyxel	Nr5103	-	All	All	All
Hardware	Zyxel	Nr5103e	-	All	All	All
Operating System	Zyxel	Nr5103e Firmware	All	All	All	All
Operating System	Zyxel	Nr5103 Firmware	All	All	All	All
Hardware	Zyxel	Nr5309	-	All	All	All
Operating System	Zyxel	Nr5309 Firmware	All	All	All	All
Hardware	Zyxel	Nr7302	-	All	All	All
Operating System	Zyxel	Nr7302 Firmware	All	All	All	All
Hardware	Zyxel	Nr7303	-	All	All	All
Operating System	Zyxel	Nr7303 Firmware	All	All	All	All

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Zyxel	DX3301-T0 Firmware	affected <= 5.50(ABVY.6.3)C0	Not specified

References

Reference	Source	Link	Tags
www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory...	[email protected]	www.zyxel.com	Vendor Advisory
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

There are currently no legacy QID mappings associated with this CVE.