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THREATINT
PUBLISHED

CVE-2025-4600

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



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.

Reserved 2025-05-12 | Published 2025-05-16 | Updated 2025-05-16 | Assigner Google


HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:L/SA:L

Problem types

CWE-20 Improper Input Validation

Product status

Default status
unaffected

Any version
affected

Credits

Jeppe Bonde Weikop reporter

References

cloud.google.com/support/bulletins

cve.org (CVE-2025-4600)

nvd.nist.gov (CVE-2025-4600)

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