CVE-2025-7673 — Classic Buffer Overflow in Zyxel Vmg8825-t50k Firmware

CWE-120 — Classic Buffer Overflow4 documents4 sources
Severity
9.8CRITICALNVD
EPSS
0.7%
top 28.95%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
24
Zyxel Vmg8825-t50k FirmwareZyxel Emg3525-t50b FirmwareZyxel Emg5523-t50b Firmware+21 more
Timeline
PublishedJul 16

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 vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages25 packages

▶CVEListV5zyxel/vmg8825-t50k_firmware< V5.50(ABOM.5)C0
▶NVDzyxel/vmg8825-t50k_firmware< 5.50\(abom.5\)c0
▶NVDzyxel/emg5723-t50k_firmware< 5.50\(abom.5\)c0
▶NVDzyxel/vmg3927-t50k_firmware< 5.50\(abom.5\)c0
▶NVDzyxel/vmg8825-b50a_firmware< 5.15\(abmt.5\)c0

🔴Vulnerability Details

3
GHSA
GHSA-r3pp-h225-m34v: A buffer overflow vulnerability in the URL parser of the zhttpd web server in Zyxel VMG8825-T50K firmware versions prior to V5↗2025-07-16
▶
CVEList
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↗2025-07-16
▶
VulnCheck
Zyxel emg3525-t50b_firmware Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')↗2025
▶
CVE-2025-7673 — Classic Buffer Overflow in Zyxel | cvebase