CVE-2025-11915

MEDIUM

Google Cloud Vertex AI: Partner Models for MaaS - HTTP Request Smuggling via Proxy Desynchronization

Title source: llm

Description

Connection desynchronization between an HTTP proxy and the model backend. The fixes were rolled out for all proxies in front of impacted models by 2025-09-28. Users do not need to take any action.

References (1)

Core 1

Core References

Various Sources

https://cloud.google.com/vertex-ai/generative-ai/docs/security-bulletins#gcp-2025-059

Scores

CVSS v4 6.9

EPSS 0.0030

EPSS Percentile 22.3%

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:L/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Clear

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-444

Status published

Products (3)

Google Cloud/Vertex AI: Open Models for MaaS < 2025-09-28

Google Cloud/Vertex AI: Partner Models for MaaS < 2025-09-26

Google Cloud/Vertex AI: Self-Deployed Models < 2025-09-28

Published Oct 22, 2025

Tracked Since Feb 18, 2026