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CVE-2025-40710— Host Header Injection (HHI) in the Hotspot Shield VPN client

Quick assessment

Affected
Hotspot Shield Hotspot Shield VPN client
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Intersections Hotspot Shield VPN是美国Intersections公司的一款虚拟专用网络（VPN）服务产品。 Intersections Hotspot Shield VPN 存在注入漏洞，该漏洞源于处理Host头时存在注入问题，可能导致请求重定向或流量转发到攻击者控制的服务器。

AI Predicted 6.5 Difficulty: Easy EPSS 0.32% · P25
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I. Basic Information for CVE-2025-40710

Vulnerability Information
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Vulnerability Title
Host Header Injection (HHI) in the Hotspot Shield VPN client
Source: CVE Program / CVE List V5
Vulnerability Description
Host Header Injection (HHI) vulnerability in the Hotspot Shield VPN client, which can induce unexpected behaviour when accessing third-party web applications through the VPN tunnel. Although such applications do not present this vulnerability per se, the use of the tunnel, together with a forged Host header, can cause the VPN client to redirect or forward HTTP requests to servers other than those originally intended, leading to consequences such as open redirects or delivery of traffic to infrastructure controlled by an attacker. This does not imply a flaw in the target applications, but in how the VPN client internally handles outgoing headers and requests.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Intersections Hotspot Shield VPN 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Intersections Hotspot Shield VPN是美国Intersections公司的一款虚拟专用网络（VPN）服务产品。 Intersections Hotspot Shield VPN 存在注入漏洞，该漏洞源于处理Host头时存在注入问题，可能导致请求重定向或流量转发到攻击者控制的服务器。
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
Hotspot Shield Hotspot Shield VPN client 12.9.2 -

II. Public POCs for CVE-2025-40710

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III. Intelligence Information for CVE-2025-40710

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IV. Related Vulnerabilities

Same weakness: CWE-74