CVE-2025-4600 - CVE House
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Status published High CVE-2025-4600

HTTP Request Smuggling in Google Cloud Classic Application Load Balancer due to Improper Chunked Encoding Validation

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Jeppe Bonde Weikop

References

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Affected Vendor

Google Cloud

View all reports →

Affected Software

Classic Application Load Balancer
Vulnerable Versions:
0

Timeline

Official Publish: May 16th, 2025
Last Modified: September 8th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

Weaknesses (CWE)

CWE-444

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1565.002 Stored Data Manipulation
Impact
T1078 Valid Accounts
Defense Evasion