CVE-2026-3870

Upnp AddPortMapping Buffer Overflow Causes Temporary Denial of Service in Zyxel VMG4005-B50B

Published Jun 2, 2026 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Zyxel
Zyxel vmg4005-b50b Firmware
Vendors & Products Zyxel
Zyxel vmg4005-b50b Firmware
Type Values Removed Values Added
Title Upnp AddPortMapping Buffer Overflow Causes Temporary Denial of Service in Zyxel VMG4005-B50B
Type Values Removed Values Added
Description 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.
Weaknesses CWE-120
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Zyxel
Published
Updated
Jun 2, 2026, 1:36 PM
Reserved
Mar 10, 2026, 8:42 AM
Status
Deferred
Published
Jun 2, 2026, 3:16 AM
Modified
Jul 22, 2026, 7:10 PM