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Vulnerability record · CVE-2025-7673 · published 16 July 2025

CVE-2025-7673: Zyxel emg3525-t50b firmware classic buffer overflow vulnerability

Zyxel · Emg3525 T50b Firmware

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 CVSS 3.1 Critical EPSS 0.55% · top 56.5% CWE-120 · Classic buffer overflow
9.8CVSS 3.1 base score
0.55%EPSS exploitation probability, 30 days
NoNot in CISA KEV
24Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

24 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.zyxel.com/service-provider/global/en/zyxel-security-advisory-remote-code-execution-and-denial-service-vulner Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-7673), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.