HTTP Proxy Connection Desynchronization with Model Backend (CVE-2025-11915)
CVE-2025-11915 Published on October 22, 2025
HTTP Desynchronisation in Vertex AI for certain third-party models
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.
Weakness Type
What is a HTTP Request Smuggling Vulnerability?
When malformed or abnormal HTTP requests are interpreted by one or more entities in the data flow between the user and the web server, such as a proxy or firewall, they can be interpreted inconsistently, allowing the attacker to "smuggle" a request to one device without the other device being aware of it.
CVE-2025-11915 has been classified to as a HTTP Request Smuggling vulnerability or weakness.
Products Associated with CVE-2025-11915
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Affected Versions
Google Cloud Vertex AI: Partner Models for MaaS:- Before 2025-09-26 is affected.
- Before 2025-09-28 is affected.
- Before 2025-09-28 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.