CVE-2025-7673

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-7673
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.

9.8 /10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://www.zyxel.com/service-provider/global/en/zyxel-security-advisory-remote-code-execution-and-denial-service-vulnerabilities-cpe Vendor Advisory
Configurations

Configuration 1 (hide)

AND
cpe:2.3:o:zyxel:emg3525-t50b_firmware:*:*:*:*:emea:*:*:*
cpe:2.3:h:zyxel:emg3525-t50b:-:*:*:*:*:*:*:*

Configuration 2 (hide)

AND
cpe:2.3:o:zyxel:emg3525-t50b_firmware:*:*:*:*:america:*:*:*
cpe:2.3:h:zyxel:emg3525-t50b:-:*:*:*:*:*:*:*

Configuration 3 (hide)

AND
cpe:2.3:o:zyxel:emg5523-t50b_firmware:*:*:*:*:emea:*:*:*
cpe:2.3:h:zyxel:emg5523-t50b:-:*:*:*:*:*:*:*

Configuration 4 (hide)

AND
cpe:2.3:o:zyxel:emg5523-t50b_firmware:*:*:*:*:america:*:*:*
cpe:2.3:h:zyxel:emg5523-t50b:-:*:*:*:*:*:*:*

Configuration 5 (hide)

AND
cpe:2.3:o:zyxel:emg5723-t50k_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:emg5723-t50k:-:*:*:*:*:*:*:*

Configuration 6 (hide)

AND
cpe:2.3:o:zyxel:emg6726-b10a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:emg6726-b10a:-:*:*:*:*:*:*:*

Configuration 7 (hide)

AND
cpe:2.3:o:zyxel:ex3510-b0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:ex3510-b0:-:*:*:*:*:*:*:*

Configuration 8 (hide)

AND
cpe:2.3:o:zyxel:ex5510-b0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:ex5510-b0:-:*:*:*:*:*:*:*

Configuration 9 (hide)

AND
cpe:2.3:o:zyxel:vmg1312-t20b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg1312-t20b:-:*:*:*:*:*:*:*

Configuration 10 (hide)

AND
cpe:2.3:o:zyxel:vmg3625-t50b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3625-t50b:-:*:*:*:*:*:*:*

Configuration 11 (hide)

AND
cpe:2.3:o:zyxel:vmg3925-b10b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3925-b10b:-:*:*:*:*:*:*:*

Configuration 12 (hide)

AND
cpe:2.3:o:zyxel:vmg3925-b10c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3925-b10c:-:*:*:*:*:*:*:*

Configuration 13 (hide)

AND
cpe:2.3:o:zyxel:vmg3927-b50a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3927-b50a:-:*:*:*:*:*:*:*

Configuration 14 (hide)

AND
cpe:2.3:o:zyxel:vmg3927-b60a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3927-b60a:-:*:*:*:*:*:*:*

Configuration 15 (hide)

AND
cpe:2.3:o:zyxel:vmg3927-b50b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3927-b50b:-:*:*:*:*:*:*:*

Configuration 16 (hide)

AND
cpe:2.3:o:zyxel:vmg3927-t50k_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3927-t50k:-:*:*:*:*:*:*:*

Configuration 17 (hide)

AND
cpe:2.3:o:zyxel:vmg4005-b50b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg4005-b50b:-:*:*:*:*:*:*:*

Configuration 18 (hide)

AND
cpe:2.3:o:zyxel:vmg4927-b50a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg4927-b50a:-:*:*:*:*:*:*:*

Configuration 19 (hide)

AND
cpe:2.3:o:zyxel:vmg8623-t50b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8623-t50b:-:*:*:*:*:*:*:*

Configuration 20 (hide)

AND
cpe:2.3:o:zyxel:vmg8825-b50a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8825-b50a:-:*:*:*:*:*:*:*

Configuration 21 (hide)

AND
cpe:2.3:o:zyxel:vmg8825-b60a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8825-b60a:-:*:*:*:*:*:*:*

Configuration 22 (hide)

AND
cpe:2.3:o:zyxel:vmg8825-bx0b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8825-bx0b:-:*:*:*:*:*:*:*

Configuration 23 (hide)

AND
cpe:2.3:o:zyxel:vmg8825-t50k_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8825-t50k:-:*:*:*:*:*:*:*

Configuration 24 (hide)

AND
cpe:2.3:o:zyxel:vmg8924-b10d_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8924-b10d:-:*:*:*:*:*:*:*

Configuration 25 (hide)

AND
cpe:2.3:o:zyxel:xmg3927-b50a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:xmg3927-b50a:-:*:*:*:*:*:*:*

Configuration 26 (hide)

AND
cpe:2.3:o:zyxel:xmg8825-b50a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:xmg8825-b50a:-:*:*:*:*:*:*:*
History

14 Jan 2026, 17:52

Type Values Removed Values Added
CPE cpe:2.3:o:zyxel:vmg1312-t20b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3925-b10b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg4005-b50b:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8825-b50a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:emg3525-t50b:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:emg3525-t50b_firmware:*:*:*:*:america:*:*:*
cpe:2.3:o:zyxel:emg5523-t50b_firmware:*:*:*:*:america:*:*:*
cpe:2.3:h:zyxel:emg5723-t50k:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8825-bx0b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3625-t50b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:emg5723-t50k_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex3510-b0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3925-b10c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:xmg8825-b50a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3927-b50a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3625-t50b:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8825-t50k_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3927-b50b:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8825-b50a:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8825-t50k:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:ex5510-b0:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8924-b10d:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg4005-b50b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8924-b10d_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3927-b60a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3925-b10b:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:xmg3927-b50a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:emg5523-t50b:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8825-bx0b:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:ex5510-b0_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8825-b60a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3927-b50b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg4927-b50a_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3927-b60a:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg4927-b50a:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3925-b10c:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:emg5523-t50b_firmware:*:*:*:*:emea:*:*:*
cpe:2.3:h:zyxel:vmg3927-b50a:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8623-t50b_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg1312-t20b:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:ex3510-b0:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8825-b60a:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:xmg8825-b50a:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:emg6726-b10a:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3927-t50k_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg8623-t50b:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:emg3525-t50b_firmware:*:*:*:*:emea:*:*:*
cpe:2.3:h:zyxel:xmg3927-b50a:-:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:vmg3927-t50k:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:emg6726-b10a_firmware:*:*:*:*:*:*:*:*
References () https://www.zyxel.com/service-provider/global/en/zyxel-security-advisory-remote-code-execution-and-denial-service-vulnerabilities-cpe - () https://www.zyxel.com/service-provider/global/en/zyxel-security-advisory-remote-code-execution-and-denial-service-vulnerabilities-cpe - Vendor Advisory
First Time Zyxel xmg3927-b50a Firmware
Zyxel xmg8825-b50a
Zyxel vmg3625-t50b
Zyxel vmg8825-b50a Firmware
Zyxel ex5510-b0 Firmware
Zyxel xmg8825-b50a Firmware
Zyxel vmg8825-t50k
Zyxel vmg3927-b60a Firmware
Zyxel vmg3927-b60a
Zyxel vmg3925-b10b
Zyxel emg5723-t50k
Zyxel emg5723-t50k Firmware
Zyxel vmg3925-b10b Firmware
Zyxel vmg3625-t50b Firmware
Zyxel ex5510-b0
Zyxel vmg3925-b10c Firmware
Zyxel emg3525-t50b
Zyxel vmg4927-b50a
Zyxel vmg8623-t50b Firmware
Zyxel emg3525-t50b Firmware
Zyxel vmg8924-b10d Firmware
Zyxel vmg1312-t20b Firmware
Zyxel vmg8825-b50a
Zyxel emg5523-t50b Firmware
Zyxel vmg4005-b50b
Zyxel vmg3925-b10c
Zyxel ex3510-b0 Firmware
Zyxel vmg1312-t20b
Zyxel vmg4927-b50a Firmware
Zyxel vmg8825-t50k Firmware
Zyxel vmg3927-t50k
Zyxel vmg3927-b50b
Zyxel vmg8623-t50b
Zyxel vmg4005-b50b Firmware
Zyxel emg5523-t50b
Zyxel
Zyxel emg6726-b10a
Zyxel vmg8825-b60a
Zyxel vmg8825-bx0b
Zyxel emg6726-b10a Firmware
Zyxel vmg3927-t50k Firmware
Zyxel vmg8924-b10d
Zyxel vmg3927-b50b Firmware
Zyxel vmg3927-b50a Firmware
Zyxel vmg3927-b50a
Zyxel vmg8825-bx0b Firmware
Zyxel vmg8825-b60a Firmware
Zyxel xmg3927-b50a
Zyxel ex3510-b0

16 Jul 2025, 14:58

Type Values Removed Values Added
Summary
  • (es) Una vulnerabilidad de desbordamiento de búfer en el analizador de URL del servidor web zhttpd en versiones de firmware Zyxel VMG8825-T50K anteriores a V5.50(ABOM.5)C0 podría permitir que un atacante no autenticado provoque condiciones de denegación de servicio (DoS) y potencialmente ejecute código arbitrario enviando una solicitud HTTP especialmente manipulada.

16 Jul 2025, 07:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-07-16 07:15

Updated : 2026-01-14 17:52

NVD link : CVE-2025-7673

Mitre link : CVE-2025-7673

CVE.ORG link : CVE-2025-7673

JSON object : View

Products Affected

zyxel

  • emg5523-t50b
  • vmg8825-bx0b_firmware
  • emg5523-t50b_firmware
  • vmg8924-b10d_firmware
  • vmg8825-b60a
  • vmg3925-b10b
  • emg3525-t50b
  • vmg1312-t20b
  • vmg3925-b10b_firmware
  • emg6726-b10a
  • emg5723-t50k_firmware
  • vmg8825-b60a_firmware
  • vmg3927-b50a
  • vmg4927-b50a_firmware
  • vmg8825-bx0b
  • emg3525-t50b_firmware
  • vmg4927-b50a
  • ex5510-b0
  • vmg3927-b60a_firmware
  • vmg3927-b50a_firmware
  • vmg8825-t50k
  • vmg3625-t50b
  • xmg3927-b50a
  • xmg3927-b50a_firmware
  • vmg1312-t20b_firmware
  • vmg3927-t50k_firmware
  • vmg8623-t50b
  • xmg8825-b50a
  • vmg3927-t50k
  • vmg3925-b10c
  • vmg4005-b50b
  • vmg8924-b10d
  • vmg3927-b50b_firmware
  • vmg8825-t50k_firmware
  • xmg8825-b50a_firmware
  • vmg8825-b50a_firmware
  • vmg4005-b50b_firmware
  • ex3510-b0
  • vmg3925-b10c_firmware
  • vmg8825-b50a
  • ex5510-b0_firmware
  • vmg8623-t50b_firmware
  • ex3510-b0_firmware
  • emg5723-t50k
  • vmg3927-b50b
  • emg6726-b10a_firmware
  • vmg3927-b60a
  • vmg3625-t50b_firmware
CWE
CWE-120

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')