Advisories

Zyxel CPE zhttpd Webserver Buffer Overflow RCE

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severity
critical
date
Affecting
  • Multiple Customer Premises Equipment (CPE) devices, models, and versions

CVE type
CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CVSS
9.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/PR:N/UI:N/S:U/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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. Exploitation evidence was observed by the Shadowserver Foundation on 2025-02-06 UTC.

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