CVE-2023-41705Network attack vector

Authenticated availability degradation via unbounded DAV user-agent processing

Published Feb 12, 2024 · Updated Nov 4, 2025

Resource exhaustion in Open-Xchange OX App Suite backend 8.20 and earlier allows remote authenticated users to degrade availability via DAV requests. The backend processes user-controlled DAV User-Agent strings without bounding processing time, allowing crafted values to consume excessive resources. A valid low-privilege account is required, and the documented consequence is high server load rather than data access or modification.

CVSS severity6.5
Medium
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Open-Xchange OX App Suite backend 8.20 and earlier allows remote authenticated users to degrade availability via DAV requests. The backend processes user-controlled DAV User-Agent strings without bounding processing time, allowing crafted values to consume excessive resources. A valid low-privilege account is required, and the documented consequence is high server load rather than data access or modification.

The record

CVE
CVE-2023-41705
Published
Feb 12, 2024
Updated
Nov 4, 2025
Vendor
Open-Xchange GmbH
Product
OX App Suite
Classifications
CWE-400, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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 <=7.10.6-rev55
  2. Affected versionversion=0 <=7.6.3-rev71
  3. Affected versionversion=0 <=8.20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open-Xchange GmbH · OX App Suiteversion=0 <=7.10.6-rev55; version=0 <=7.6.3-rev71; version=0 <=8.20

Published CVSS scores

6.5Open-Xchange GmbHCVSS:3.1/AV:N/AC:L/PR:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

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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