CVE-2025-4600— HTTP Request Smuggling in Google Cloud Classic Application Load Balancer due to Improper Chunked Encoding Validation
Quick assessment
Affected
Google Cloud Classic Application Load Balancer
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.
Google Cloud Classic Application Load Balancer是美国谷歌（Google）公司的一个传统应用负载均衡服务，用于在云环境中自动分配流量到后端服务实例。 Google Cloud Classic Application Load Balancer存在安全漏洞，该漏洞源于对分块编码HTTP请求处理不当，可能导致请求走私攻击。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-4600
Vulnerability Information
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Vulnerability Title
HTTP Request Smuggling in Google Cloud Classic Application Load Balancer due to Improper Chunked Encoding Validation
Source: CVE Program / CVE List V5
Vulnerability Description
A request smuggling vulnerability existed in the Google Cloud Classic Application Load Balancer due to improper handling of chunked-encoded HTTP requests. This allowed attackers to craft requests that could be misinterpreted by backend servers. The issue was fixed by disallowing stray data after a chunk, and is no longer exploitable. No action is required as Classic Application Load Balancer service after 2025-04-26 is not vulnerable.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
Google Cloud Classic Application Load Balancer 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Cloud Classic Application Load Balancer是美国谷歌（Google）公司的一个传统应用负载均衡服务，用于在云环境中自动分配流量到后端服务实例。 Google Cloud Classic Application Load Balancer存在安全漏洞，该漏洞源于对分块编码HTTP请求处理不当，可能导致请求走私攻击。
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 |
|---|---|---|---|---|
| Google Cloud | Classic Application Load Balancer | 0 | - |
|
II. Public POCs for CVE-2025-4600
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2025-4600 (1)
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V. Comments for CVE-2025-4600
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