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.
History

Tue, 29 Jul 2025 13:15:00 +0000

Type Values Removed Values Added
First Time appeared Google
Google application Load Balancer
CPEs cpe:2.3:a:google:application_load_balancer:*:*:*:*:*:*:*:*
Vendors & Products Google
Google application Load Balancer
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}


Fri, 16 May 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 16 May 2025 14:00:00 +0000

Type Values Removed Values Added
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.
Title HTTP Request Smuggling in Google Cloud Classic Application Load Balancer due to Improper Chunked Encoding Validation
Weaknesses CWE-20
References
Metrics cvssV4_0

{'score': 8.7, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Google

Published: 2025-05-16T13:47:45.266Z

Updated: 2025-05-16T14:54:22.843Z

Reserved: 2025-05-12T17:25:11.459Z

Link: CVE-2025-4600

cve-icon Vulnrichment

Updated: 2025-05-16T14:54:18.102Z

cve-icon NVD

Status : Analyzed

Published: 2025-05-16T14:15:32.580

Modified: 2025-07-29T13:03:31.870

Link: CVE-2025-4600

cve-icon Redhat

No data.