CVE-2023-41705VulnerabilityPublished 12 Feb 2024Updated 4 Nov 2025

CVE-2023-41705: Open-Xchange OX App Suite · Uncontrolled Resource Consumption

Affects Open-Xchange OX App SuiteSource CVE Database V5

Not known to be exploited · CVSS 6.5 Medium.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score

6.5Medium

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

EPSS: 0.7% chance of exploitation in 30 days – higher than 55% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
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: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
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 12 Feb 2024
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-2023-41705, European organizations should: 1) Immediately apply the official patches and updates provided by Open-Xchange GmbH that introduce monitoring and termination of excessive DAV user-agent processing. 2) Implement network-level protections such as rate limiting and filtering of suspicious DAV user-agent strings to reduce the risk of resource exhaustion attacks. 3) Monitor OX App Suite server performance and logs for unusual spikes in processing time or resource usage related to DAV requests. 4) Employ application-layer firewalls or intrusion prevention systems capable of detecting and blocking anomalous DAV user-agent patterns. 5) Conduct regular vulnerability assessments and penetration testing focused on resource consumption vectors. 6) Maintain an incident response plan to quickly address potential denial-of-service incidents affecting collaboration services. These steps go beyond generic advice by focusing on proactive monitoring, network filtering, and rapid patch deployment tailored to the specific vulnerability vector.

Description

Processing of user-defined DAV user-agent strings is not limited. Availability of OX App Suite could be reduced due to high processing load. Please deploy the provided updates and patch releases. Processing time of DAV user-agents now gets monitored, and the related request is terminated if a resource threshold is reached. No publicly available exploits are known.

Impact

For European organizations, the primary impact of CVE-2023-41705 is the potential reduction in availability of the OX App Suite, which is widely used for email, collaboration, and productivity services. A successful exploitation could lead to denial-of-service conditions, disrupting business communications and workflows. This is particularly critical for sectors relying heavily on continuous email and collaboration platforms, such as finance, government, healthcare, and education. While the vulnerability does not compromise data confidentiality or integrity, service outages can cause operational delays, loss of productivity, and reputational damage. Additionally, availability issues could indirectly affect compliance with data protection regulations like GDPR if service interruptions impact timely data processing or communication. The lack of public exploits reduces immediate risk, but the ease of exploitation and network accessibility mean that threat actors could develop attacks if the vulnerability remains unpatched.

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 5 Nov 2025, 00:54 UTC

Technical details

References

Community reviews

Related threats