VulnerabilityDeferred

CVE-2026-33607

An attacker that has valid credentials can use IMAP LIST command to consume CPU.

MEDIUM 4.3EPSS 0.29%

Does this matter?

Lower severity and a low EPSS score (0.29%). Track it; it rarely justifies an emergency change on its own.

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 3.1: 4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
EPSS: 0.29% probability · 21th percentile
CISA KEV: Not listed
Weakness: CWE-400
Source: security@open-xchange.com

References

https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.