CVE-2026-33607: Uncontrolled Resource Consumption in Open-Xchange GmbH OX Dovecot Pro
Description
CVE-2026-33607 is a medium severity vulnerability in Open-Xchange GmbH's OX Dovecot Pro where an authenticated attacker can use the IMAP LIST command to cause uncontrolled CPU consumption. This may lead to performance degradation or denial of service for the IMAP service. No public exploits are known. Mitigation involves monitoring CPU usage, terminating offending processes, locking the attacker account, or installing a fixed version if available.
CVSS v3.1
Score 4.3medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-33607) affects OX Dovecot Pro and allows an attacker with valid credentials to exploit the IMAP LIST command to consume excessive CPU resources. This uncontrolled resource consumption can degrade service or cause denial of service conditions for IMAP. The CVSS 3.1 base score is 4.3 (medium severity), indicating low complexity and no impact on confidentiality or integrity but an impact on availability. No public exploits are currently known. The vulnerability is categorized under CWE-400 (Uncontrolled Resource Consumption).
Potential Impact
An attacker with valid credentials can cause high CPU usage on the IMAP service, potentially degrading performance or causing denial of service. There is no impact on confidentiality or integrity of data. The service availability is affected due to resource exhaustion.
Mitigation Recommendations
Currently, no official patch or fixed version is explicitly referenced. Mitigation involves monitoring the system for abnormal CPU usage, killing offending processes, and locking the attacker’s account. Installing a fixed version is recommended if and when it becomes available. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-55w3-v95w-x9w3
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-33607"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 3.1
Threat ID: 6a91a7bfacd9273b490651d9
Added to database: 08/28/2026, 15:22:39 UTC
Last enriched: 09/10/2026, 02:08:58 UTC
Last updated: 10/12/2026, 18:48:19 UTC
Views: 30
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