CVE-2020-24386

Publication date 4 January 2021

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

An issue was discovered in Dovecot before 2.3.13. By using IMAP IDLE, an authenticated attacker can trigger unhibernation via attacker-controlled parameters, leading to access to other users' email messages (and path disclosure).

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
dovecot	20.10 groovy	Fixed 1:2.3.11.3+dfsg1-2ubuntu0.1
	20.04 LTS focal	Fixed 1:2.3.7.2-1ubuntu3.3
	18.04 LTS bionic	Fixed 1:2.2.33.2-1ubuntu4.7
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

mdeslaur

per upstream, Vulnerable version: 2.2.26-2.3.11.3

Severity score breakdown

Parameter	Value
Base score	6.8 · Medium
Attack vector	Network
Attack complexity	High
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N