CVE-2026-3870
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Zyxel | VMG4005-B50B firmware | <= 5.13(ABRL.5.4)C0 | affected |
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I. Basic Information for CVE-2026-3870
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
Vulnerability Title
Zyxel VMG4005-B50B 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zyxel VMG4005-B50B是中国合勤（Zyxel）公司的一款VDSL2/ADSL2+宽带调制解调器。 Zyxel VMG4005-B50B firmware 5.13(ABRL.5.4)C0及之前版本存在安全漏洞，该漏洞源于UPnP AddPortMapping命令存在缓冲区溢出，可能导致相邻攻击者触发临时拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Zyxel | VMG4005-B50B firmware | <= 5.13(ABRL.5.4)C0 | - |
II. Public POCs for CVE-2026-3870
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-3870 (1)
IV. Related Vulnerabilities
Same weakness: CWE-120
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Tenda G0 httpd web management interface module setPortMappin
V. Comments for CVE-2026-3870
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