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CVE-2025-8760— INSTAR 2K+/4K fcgi_server base64_decode buffer overflow

CVSS 9.8 · Critical EPSS 0.26% · P49
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I. Basic Information for CVE-2025-8760

Vulnerability Information
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Vulnerability Title
INSTAR 2K+/4K fcgi_server base64_decode buffer overflow
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability was identified in INSTAR 2K+ and 4K 3.11.1 Build 1124. This affects the function base64_decode of the component fcgi_server. The manipulation of the argument Authorization leads to buffer overflow. It is possible to initiate the attack remotely.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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
INSTAR 2K+和INSTAR 4K 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
INSTAR 2K+和INSTAR 4K都是德国INSTAR公司的一款网络摄像头。 INSTAR 2K+和INSTAR 4K 3.11.1 Build 1124版本存在安全漏洞，该漏洞源于fcgi_server组件base64_decode函数对Authorization参数操作导致缓冲区溢出。
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)

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Affected Products

VendorProductAffected VersionsCPESubscribe
INSTAR2K+ 3.11.1 Build 1124 -
INSTAR4K 3.11.1 Build 1124 -

II. Public POCs for CVE-2025-8760

#POC DescriptionSource LinkShenlong Link
1Proof of Concept for CVE-2025-8760https://github.com/born0monday/CVE-2025-8760POC Details
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III. Intelligence Information for CVE-2025-8760

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Same Patch Batch · INSTAR · 2025-08-13 · 3 CVEs total

CVE-2025-87617.5 HIGHINSTAR 2K+/4K Backend IPC Server denial of service
CVE-2025-87626.8 MEDIUMINSTAR 2K+/4K UART improper physical access control

IV. Related Vulnerabilities

Same product: 2K+
Same vendor: INSTAR
Same weakness: CWE-120

V. Comments for CVE-2025-8760

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