CVE-2025-4600

HIGH

Google Cloud Classic Application Load Balancer < 2025-04-26 - HTTP Request Smuggling via Chunked Encoding

Title source: llm

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.

References (1)

Core 1

Core References

Vendor Advisory

https://cloud.google.com/support/bulletins#gcp-2025-027

Scores

CVSS v3 7.5

EPSS 0.0019

EPSS Percentile 8.4%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-444

Status published

Products (1)

google/application_load_balancer < 2025-04-26

Published May 16, 2025

Tracked Since Feb 18, 2026