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CRITICAL · 9.8

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-s...

Vulnerability 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.

CVSS Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
ZyxelEmg3525-T50B Firmware< 5.50\(abpm.4\)c0
ZyxelEmg3525-T50B-
ZyxelEmg5523-T50B Firmware< 5.50\(abpm.4\)c0
ZyxelEmg5523-T50B-
ZyxelEmg5723-T50K Firmware< 5.50\(abom.5\)c0
ZyxelEmg5723-T50K-
ZyxelEmg6726-B10A Firmware< 5.13\(abnp.6\).c
ZyxelEmg6726-B10A-
ZyxelEx3510-B0 Firmware< 5.17\(abup.3\)c0
ZyxelEx3510-B0-
ZyxelEx5510-B0 Firmware< 5.15\(abqx.3\)c0
ZyxelEx5510-B0-
ZyxelVmg1312-T20B Firmware< 5.50\(absb.3\)c0
ZyxelVmg1312-T20B-
ZyxelVmg3625-T50B Firmware< 5.50\(abpm.4\)c0
ZyxelVmg3625-T50B-
ZyxelVmg3925-B10B Firmware< 5.13\(aavf.16\)c
ZyxelVmg3925-B10B-
ZyxelVmg3925-B10C Firmware< 5.13\(aavf.16\)c
ZyxelVmg3925-B10C-

Related Weaknesses (CWE)

CWE-120

References

FAQ

What is CVE-2025-7673?

CVE-2025-7673 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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-s...

How severe is CVE-2025-7673?

CVE-2025-7673 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2025-7673?

Check the references section above for vendor advisories and patch information. Affected products include: Zyxel Emg3525-T50B Firmware, Zyxel Emg3525-T50B, Zyxel Emg5523-T50B Firmware, Zyxel Emg5523-T50B, Zyxel Emg5723-T50K Firmware.