CVE-2025-30188Network attack vector

Web frontend interruption via version-header cache pollution

Published Oct 31, 2025 · Updated Oct 31, 2025

Cache pollution in the UI middleware in Open-Xchange OX App Suite 2.1.7 and earlier allows remote attackers to interrupt the web frontend. The middleware accepts a client-supplied version header as a new cache version, allowing crafted API requests to fill caches and evict data needed by the frontend. No authentication or user interaction is required, and successful exploitation makes the web frontend unavailable without affecting confidentiality or integrity.

CVSS severity7.5
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cache pollution in the UI middleware in Open-Xchange OX App Suite 2.1.7 and earlier allows remote attackers to interrupt the web frontend. The middleware accepts a client-supplied version header as a new cache version, allowing crafted API requests to fill caches and evict data needed by the frontend. No authentication or user interaction is required, and successful exploitation makes the web frontend unavailable without affecting confidentiality or integrity.

The record

CVE
CVE-2025-30188
Published
Oct 31, 2025
Updated
Oct 31, 2025
Vendor
Open-Xchange GmbH
Product
OX App Suite
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 31, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 31, 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 <=2.1.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Open-Xchange GmbH · OX App Suiteversion=0 <=2.1.7

Published CVSS scores

7.5Open-XchangeCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

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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