CVE-2026-3871 [MEDIUM] – A buffer overflow vulnerability in the UPnP DeletePortMapping() command in Zyxel VMG4005-B

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.