Is CVE-2025-6599 actively exploited?

CVE-2025-6599 has no public evidence of in-the-wild exploitation as of 2025-12-16.

What is the CVSS score for CVE-2025-6599?

CVE-2025-6599 has a CVSS score of 5.3 (MEDIUM severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

How do I patch CVE-2025-6599?

Patch guidance is available from zyxel security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2025-6599.

CVE-2025-6599 - remediation guidance & executive summary

Q: Which products are affected by CVE-2025-6599?

68 products: zyxel lte3301-plus firmware, zyxel nr5103 firmware, zyxel nr5103e firmware, zyxel nr5309 firmware, zyxel nr7302 firmware, and 63 more.

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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: low
Weaknesses: CWE-400

Metadata

Primary Vendor: ZYXEL
Published: 11/18/2025
Last Modified: 12/16/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

zyxel : lte3301-plus_firmwarezyxel : nr5103_firmwarezyxel : nr5103e_firmwarezyxel : nr5309_firmwarezyxel : nr7302_firmwarezyxel : nr7303_firmwarezyxel : nebula_fwa505_firmwarezyxel : nebula_fwa510_firmwarezyxel : nebula_fwa515_firmwarezyxel : nebula_fwa710_firmwarezyxel : dm4200-b0_firmwarezyxel : dx3300-t0_firmwarezyxel : dx3300-t1_firmwarezyxel : dx3301-t0_firmwarezyxel : dx4510-b1_firmwarezyxel : dx5401-b0_firmwarezyxel : dx5401-b1_firmwarezyxel : ee3301-00_firmwarezyxel : ee5301-00_firmwarezyxel : ee6510-10_firmwarezyxel : ex3300-t0_firmwarezyxel : ex3300-t0_firmwarezyxel : ex3300-t1_firmwarezyxel : ex3301-t0_firmwarezyxel : ex3500-t0_firmwarezyxel : ex3501-t0_firmwarezyxel : ex3600-t0_firmwarezyxel : ex5401-b0_firmwarezyxel : ex5401-b1_firmwarezyxel : ex5501-b0_firmwarezyxel : ex5510-b0_firmwarezyxel : ex5512-t0_firmwarezyxel : ex5601-t0_firmwarezyxel : ex5601-t1_firmwarezyxel : ex7501-b0_firmwarezyxel : ex7710-b0_firmwarezyxel : emg3525-t50b_firmwarezyxel : emg5523-t50b_firmwarezyxel : emg5723-t50k_firmwarezyxel : emg6726-b10a_firmwarezyxel : gm4100-b0_firmwarezyxel : vmg3625-t50b_firmwarezyxel : vmg3927-b50b_firmwarezyxel : vmg3927-t50k_firmwarezyxel : vmg4005-b50a_firmwarezyxel : vmg4005-b60a_firmwarezyxel : vmg4005-b50b_firmwarezyxel : vmg4927-b50a_firmwarezyxel : vmg8623-t50b_firmwarezyxel : vmg8825-t50k_firmwarezyxel : ax7501-b0_firmwarezyxel : ax7501-b1_firmwarezyxel : pe3301-00_firmwarezyxel : pe5301-01_firmwarezyxel : pm3100-t0_firmwarezyxel : pm5100-t0_firmwarezyxel : pm7500-00_firmwarezyxel : pm7300-t0_firmwarezyxel : px3321-t1_firmwarezyxel : px3321-t1_firmwarezyxel : px5301-t0_firmwarezyxel : scr_50axe_firmwarezyxel : we3300-00_firmwarezyxel : wx3100-t0_firmwarezyxel : wx3401-b0_firmwarezyxel : wx3401-b1_firmwarezyxel : wx5600-t0_firmwarezyxel : wx5610-b0_firmware

Remediation Guidance

Executive Summary

View on NIST NVD