CVE-2026-33607

Deferred Deferred - Pending Action

BaseFortify

Publication date: 2026-08-28

Last updated on: 2026-09-03

Assigner: Open-Xchange

Description

An attacker that has valid credentials can use IMAP LIST command to consume CPU. This can cause degradation or denial of service for IMAP. Monitor system for abnormal CPU usage and kill the offending process and lock account. Alternatively install fixed version. No publicly available exploits are known.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-28

Last Modified

2026-09-03

Generated

2026-10-08

AI Q&A

2026-08-28

EPSS Evaluated

2026-10-07

NVD

CVE-2026-33607

EUVD

EUVD-2026-67662

Affected Vendors & Products

Vendor	Product	Version / Range
Open-Xchange	GmbH	OX Dovecot Pro 2.3.0
Open-Xchange	GmbH	OX Dovecot Pro 3.1.0
Open-Xchange	GmbH	OX Dovecot CE 2.3.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-400	The product does not properly control the allocation and maintenance of a limited resource.

Attack-Flow Graph

Executive Summary

This vulnerability allows an attacker with valid credentials to exploit the IMAP LIST command, causing high CPU consumption. This can degrade system performance or lead to a denial of service for IMAP services.

Detection Guidance

Monitor system CPU usage for abnormal spikes. Use commands like 'top', 'htop', or 'ps aux' to identify processes consuming excessive CPU. Check IMAP service logs for repeated LIST command usage.

Impact Analysis

It can cause system slowdowns or crashes due to excessive CPU usage. Users may experience degraded IMAP service performance or complete unavailability. Affected accounts should be locked and processes terminated.

Compliance Impact

This vulnerability could indirectly impact compliance with GDPR or HIPAA by causing service degradation or denial of service for IMAP, potentially affecting data availability. However, the primary risk is operational disruption rather than direct data exposure or privacy violations.

Mitigation Strategies

Kill the offending process consuming high CPU and lock the associated user account. Install the fixed version of the IMAP service to prevent recurrence.

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