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CVE-2026-8764— H3C Magic B3 aspForm UpdateWanParams buffer overflow

CVSS 7.2 · High EPSS 0.05% · P16

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
H3CMagic B3100R002affected
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I. Basic Information for CVE-2026-8764

Vulnerability Information
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Vulnerability Title
H3C Magic B3 aspForm UpdateWanParams buffer overflow
Source: NVD (National Vulnerability Database)
Vulnerability Description
A security vulnerability has been detected in H3C Magic B3 up to 100R002. This affects the function UpdateWanParams of the file /goform/aspForm. Such manipulation of the argument param leads to buffer overflow. The attack may be performed from remote. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/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)
Vulnerability Title
H3C Magic B3 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
H3C Magic B3是中国新华三（H3C）公司的一款无线路由器。 H3C Magic B3 100R002及之前版本存在缓冲区错误漏洞，该漏洞源于/goform/aspForm文件中UpdateWanParams函数对参数param处理不当，导致缓冲区溢出。
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

VendorProductAffected VersionsCPESubscribe
H3CMagic B3 100R002 cpe:2.3:a:h3c:magic_b3:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-8764

#POC DescriptionSource LinkShenlong Link
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Qwen3.6-35B-A3B · 7389 chars
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III. Intelligence Information for CVE-2026-8764

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Other References for CVE-2026-8764 (1)

IV. Related Vulnerabilities

Same product: Magic B3
Same vendor: H3C
Same weakness: CWE-120

V. Comments for CVE-2026-8764

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