CVE-2026-3870 — Zyxel / VMG4005-B50B firmware

CVE-2026-3870

Zyxel / VMG4005-B50B firmware PUBLISHED

Description (CNA)

A buffer overflow vulnerability in the UPnP AddPortMapping() 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.

Affected (CNA)

Vendor / product	Versions
Zyxel / VMG4005-B50B firmware	affected <= 5.13(ABRL.5.4)C0

CWE

CWE-120

References

https://www.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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.