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CVE-2025-8761— INSTAR 2K+/4K Backend IPC Server denial of service

Quick assessment

Affected
INSTAR 2K+
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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Backend IPC Server组件可能导致拒绝服务攻击。

CVSS 7.5 · High EPSS 8.02% · P95
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I. Basic Information for CVE-2025-8761

Vulnerability Information
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Vulnerability Title
INSTAR 2K+/4K Backend IPC Server denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability has been found in INSTAR 2K+ and 4K 3.11.1 Build 1124. This vulnerability affects unknown code of the component Backend IPC Server. The manipulation leads to denial of service. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当的资源关闭或释放
Source: CVE Program / CVE List V5
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Backend IPC Server组件可能导致拒绝服务攻击。
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
INSTAR 2K+ 3.11.1 Build 1124 -
INSTAR 4K 3.11.1 Build 1124 -

II. Public POCs for CVE-2025-8761

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III. Intelligence Information for CVE-2025-8761

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

CVE-2025-8760 9.8 CRITICAL INSTAR 2K+/4K fcgi_server base64_decode buffer overflow
CVE-2025-8762 6.8 MEDIUM INSTAR 2K+/4K UART improper physical access control

IV. Related Vulnerabilities

Same product: 2K+
Same vendor: INSTAR
Same weakness: CWE-404

V. Comments for CVE-2025-8761

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