CVE-2025-7673

Published Jul 16, 2025 CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Description
A buffer overflow vulnerability in the URL parser of the zhttpd web server in Zyxel VMG8825-T50K firmware versions prior to V5.50(ABOM.5)C0 could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and potentially execute arbitrary code by sending a specially crafted HTTP request.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-21579 A buffer overflow vulnerability in the URL parser of the zhttpd web server in Zyxel VMG8825-T50K firmware versions prior to V5.50(ABOM.5)C0 could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and potentially execute arbitrary code by sending a specially crafted HTTP request.
History
Type Values Removed Values Added
First Time appeared Zyxel emg3525-t50b
Zyxel emg3525-t50b Firmware
Zyxel emg5523-t50b
Zyxel emg5523-t50b Firmware
Zyxel emg5723-t50k
Zyxel emg5723-t50k Firmware
Zyxel emg6726-b10a
Zyxel emg6726-b10a Firmware
Zyxel ex3510-b0
Zyxel ex3510-b0 Firmware
Zyxel ex5510-b0
Zyxel ex5510-b0 Firmware
Zyxel vmg1312-t20b
Zyxel vmg1312-t20b Firmware
Zyxel vmg3625-t50b
Zyxel vmg3625-t50b Firmware
Zyxel vmg3925-b10b
Zyxel vmg3925-b10b Firmware
Zyxel vmg3925-b10c
Zyxel vmg3925-b10c Firmware
Zyxel vmg3927-b50a
Zyxel vmg3927-b50a Firmware
Zyxel vmg3927-b50b
Zyxel vmg3927-b50b Firmware
Zyxel vmg3927-b60a
Zyxel vmg3927-b60a Firmware
Zyxel vmg3927-t50k
Zyxel vmg3927-t50k Firmware
Zyxel vmg4005-b50b
Zyxel vmg4005-b50b Firmware
Zyxel vmg4927-b50a
Zyxel vmg4927-b50a Firmware
Zyxel vmg8623-t50b
Zyxel vmg8623-t50b Firmware
Zyxel vmg8825-b50a
Zyxel vmg8825-b50a Firmware
Zyxel vmg8825-b60a
Zyxel vmg8825-b60a Firmware
Zyxel vmg8825-bx0b
Zyxel vmg8825-bx0b Firmware
Zyxel vmg8825-t50k
Zyxel vmg8924-b10d
Zyxel vmg8924-b10d Firmware
Zyxel xmg3927-b50a
Zyxel xmg3927-b50a Firmware
Zyxel xmg8825-b50a
Zyxel xmg8825-b50a Firmware
CPEs cpe:2.3:h:zyxel:emg3525-t50b:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:emg5523-t50b:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:emg5723-t50k:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:emg6726-b10a:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:ex3510-b0:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:ex5510-b0:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg1312-t20b:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3625-t50b:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3925-b10b:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3925-b10c:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3927-b50a:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3927-b50b:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3927-b60a:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3927-t50k:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg4005-b50b:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg4927-b50a:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8623-t50b:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8825-b50a:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8825-b60a:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8825-bx0b:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8825-t50k:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8924-b10d:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:xmg3927-b50a:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:xmg8825-b50a:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:emg3525-t50b_firmware:*:*:*:*:america:*:*:*
cpe:2.3:o:zyxel:emg3525-t50b_firmware:*:*:*:*:emea:*:*:*
cpe:2.3:o:zyxel:emg5523-t50b_firmware:*:*:*:*:america:*:*:*
cpe:2.3:o:zyxel:emg5523-t50b_firmware:*:*:*:*:emea:*:*:*
cpe:2.3:o:zyxel:emg5723-t50k_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:emg6726-b10a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex3510-b0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex5510-b0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg1312-t20b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3625-t50b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3925-b10b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3925-b10c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3927-b50a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3927-b50b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3927-b60a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3927-t50k_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg4005-b50b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg4927-b50a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8623-t50b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8825-b50a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8825-b60a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8825-bx0b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8825-t50k_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8924-b10d_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:xmg3927-b50a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:xmg8825-b50a_firmware:*:*:*:*:*:*:*:*
Vendors & Products Zyxel emg3525-t50b
Zyxel emg3525-t50b Firmware
Zyxel emg5523-t50b
Zyxel emg5523-t50b Firmware
Zyxel emg5723-t50k
Zyxel emg5723-t50k Firmware
Zyxel emg6726-b10a
Zyxel emg6726-b10a Firmware
Zyxel ex3510-b0
Zyxel ex3510-b0 Firmware
Zyxel ex5510-b0
Zyxel ex5510-b0 Firmware
Zyxel vmg1312-t20b
Zyxel vmg1312-t20b Firmware
Zyxel vmg3625-t50b
Zyxel vmg3625-t50b Firmware
Zyxel vmg3925-b10b
Zyxel vmg3925-b10b Firmware
Zyxel vmg3925-b10c
Zyxel vmg3925-b10c Firmware
Zyxel vmg3927-b50a
Zyxel vmg3927-b50a Firmware
Zyxel vmg3927-b50b
Zyxel vmg3927-b50b Firmware
Zyxel vmg3927-b60a
Zyxel vmg3927-b60a Firmware
Zyxel vmg3927-t50k
Zyxel vmg3927-t50k Firmware
Zyxel vmg4005-b50b
Zyxel vmg4005-b50b Firmware
Zyxel vmg4927-b50a
Zyxel vmg4927-b50a Firmware
Zyxel vmg8623-t50b
Zyxel vmg8623-t50b Firmware
Zyxel vmg8825-b50a
Zyxel vmg8825-b50a Firmware
Zyxel vmg8825-b60a
Zyxel vmg8825-b60a Firmware
Zyxel vmg8825-bx0b
Zyxel vmg8825-bx0b Firmware
Zyxel vmg8825-t50k
Zyxel vmg8924-b10d
Zyxel vmg8924-b10d Firmware
Zyxel xmg3927-b50a
Zyxel xmg3927-b50a Firmware
Zyxel xmg8825-b50a
Zyxel xmg8825-b50a Firmware
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Metrics epss

{'score': 0.00729}

Type Values Removed Values Added
Description A buffer overflow vulnerability in the URL parser of the zhttpd web server in Zyxel VMG8825-T50K firmware versions prior to V5.50(ABOM.5)C0 could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and potentially execute arbitrary code by sending a specially crafted HTTP request.
Weaknesses CWE-120
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Zyxel
Published
Updated
Feb 26, 2026, 5:50 PM
Reserved
Jul 15, 2025, 2:01 AM
Status
Analyzed
Published
Jul 16, 2025, 7:15 AM
Modified
Jun 17, 2026, 10:05 AM