Resource exhaustion in Open-Xchange Gmbh Ox Dovecot Pro
CVE-2026-33607
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.
Vulnerability class: DoS (Denial of Service)
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
Affected products
Weakness classification (CWE)
References
- security@open-xchange.com (vendor-advisory)
Frequently asked questions
- What is CVE-2026-33607?
- CVE-2026-33607 is a medium-severity vulnerability in Open-Xchange Gmbh Ox Dovecot Pro, classified under Uncontrolled Resource Consumption. CVSS score: 4.3/10. Published 2026-08-28.
- How severe is CVE-2026-33607?
- Medium severity. CVSS v3 base score is 4.3 out of 10.