CVE-2025-30188VulnerabilityPublished 31 Oct 2025

CVE-2025-30188: Open-Xchange OX App Suite · Uncontrolled Resource Consumption

Affects Open-Xchange OX App SuiteSource CVE Database V5

Not known to be exploited · CVSS 7.5 High.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 30% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 31 Oct 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Open-Xchange GmbH OX App Suite	Affected =0	Fixed in–

AI-suggested

To mitigate CVE-2025-30188, European organizations should immediately deploy the vendor-provided patches and updates for OX App Suite. Beyond patching, organizations should implement strict rate limiting and throttling on API endpoints to prevent excessive cache data injection. Monitoring cache utilization metrics and setting alerts for abnormal cache growth can help detect early signs of exploitation. Network-level protections such as Web Application Firewalls (WAFs) should be configured to identify and block suspicious API request patterns. Additionally, segmenting the OX App Suite infrastructure and applying resource quotas can limit the impact of resource exhaustion. Regularly reviewing and updating incident response plans to include scenarios involving denial-of-service via resource exhaustion will improve preparedness. Finally, maintaining up-to-date inventories of affected systems and ensuring that all instances of OX App Suite are accounted for and patched is critical to comprehensive risk reduction.

Description

Malicious or unintentional API requests can be used to add significant amount of data to caches. Caches may evict information that is required to operate the web frontend, which leads to unavailability of the component. Please deploy the provided updates and patch releases. No publicly available exploits are known

Impact

For European organizations, the primary impact of CVE-2025-30188 is service unavailability due to denial-of-service conditions caused by cache exhaustion. Organizations relying on OX App Suite for email, calendaring, and collaboration may experience significant operational disruptions, affecting productivity and communication. This can be particularly damaging for sectors such as government, finance, healthcare, and education, where continuous availability of communication platforms is critical. The lack of confidentiality or integrity impact limits data breach concerns, but the availability impact alone can lead to financial losses, reputational damage, and compliance issues under regulations like GDPR if service outages affect user data access. Additionally, the ease of exploitation without authentication means attackers can launch attacks from external networks, increasing the threat surface. The absence of known public exploits currently reduces immediate risk but does not eliminate the potential for future exploitation. Organizations with large user bases or high transaction volumes on OX App Suite are more vulnerable to large-scale disruptions.

References

documentation.open-xchange.com/appsuite/security/advisories/csaf/2025/oxas-adv-2025-0002.json (opens in a new tab)

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 31 Oct 2025, 09:15 UTC

Technical details

References

Community reviews

Related threats