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CVE-2025-4600

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

Published: May 16, 2025Updated: Sep 26, 2025 Sources: CVE List NVDCWE-444
7.5HIGH
NVD MITRE
EPSS Score
0.2%
Top 91.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-444

Affected Products

Classic Application Load BalancerGoogle Cloud
SaaS
Cloud & SaaS / cloud-platform
application load balancergoogle
On-prem
Mobile Apps / android-app
google cloudcommercialUSCloud & SaaSaka apigee-x, looker, looker studio
googlecommercialUSMobile Appsaka google inc, google llc

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
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References

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

Timeline

Published
May 16, 2025
Last Updated
Sep 26, 2025

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