PT-2026-45689 · Zyxel · Vmg4005-B50B Firmware

Published 2026-06-02 · Updated 2026-06-02 · CVE-2026-3871

Mitre

CVSS v3.1

6.5

Medium

Base vector

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

A buffer overflow vulnerability in the UPnP DeletePortMapping() command in Zyxel VMG4005-B50B firmware versions through 5.13(ABRL.5.4)C0 could allow an adjacent attacker to trigger a temporary denial-of-service (DoS) condition affecting the UPnP function of the affected device.

Fix

Buffer Overflow

Weakness Enumeration

CWE-120

Related Identifiers

CVE-2026-3871

Affected Products

Vmg4005-B50B Firmware

References · 2

• https://zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-buffer-overflow-vulnerabilities-in-the-upnp-function-of-certain-4g-lte-5g-nr-cpe-and-dsl-ethernet-cpe-06-02-2026 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-3871 · Security Note