CVE-2025-11915Network attack vector

Cross-tenant response disclosure via proxy desynchronization

Published Oct 22, 2025 · Updated Oct 22, 2025

HTTP response desynchronization in Gemini Enterprise model services before September 28, 2025 allows remote attackers to receive misrouted responses. Internal proxies mishandle streaming requests containing an Expect: 100-continue header, shifting a response onto the next request on a reused backend connection. The issue affected certain third-party MaaS models and self-deployed models reached through public endpoints; default dedicated and private endpoints were unaffected.

CVSS severity6.9
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP response desynchronization in Gemini Enterprise model services before September 28, 2025 allows remote attackers to receive misrouted responses. Internal proxies mishandle streaming requests containing an Expect: 100-continue header, shifting a response onto the next request on a reused backend connection. The issue affected certain third-party MaaS models and self-deployed models reached through public endpoints; default dedicated and private endpoints were unaffected.

The record

CVE
CVE-2025-11915
Published
Oct 22, 2025
Updated
Oct 22, 2025
Vendor
Go standard library
Product
Gemini Enterprise Agent Platform Self-Deployed Models
Classifications
CWE-444, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2025-09-28

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Gemini Enterprise Agent Platform Self-Deployed Modelsversion=0 <2025-09-28
Go standard library · Gemini Enterprise Agent Platform Partner Models for MaaSversion=0 <2025-09-26
Go standard library · Gemini Enterprise Agent Platform Open Models for MaaSversion=0 <2025-09-28

Published CVSS scores

6.9GoogleCloudCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:L/SI:N/SA:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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