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CVE-2026-3870

CVSS 6.5 · Medium EPSS 0.02% · P4

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
ZyxelVMG4005-B50B firmware<= 5.13(ABRL.5.4)C0affected
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I. Basic Information for CVE-2026-3870

Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
ZyxelVMG4005-B50B firmware <= 5.13(ABRL.5.4)C0 -

II. Public POCs for CVE-2026-3870

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III. Intelligence Information for CVE-2026-3870

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Vendor Advisories for CVE-2026-3870 (1)

IV. Related Vulnerabilities

Same product: VMG4005-B50B firmware
Same vendor: Zyxel
Same weakness: CWE-120

V. Comments for CVE-2026-3870

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