Amazon Linux 2 : cyrus-imapd (ALAS-2021-1725)

high Nessus Plugin ID 155994


The remote Amazon Linux 2 host is missing a security update.


The version of cyrus-imapd installed on the remote host is prior to 2.4.22-1. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2021-1725 advisory.

- Cyrus IMAP before 3.4.2 allows remote attackers to cause a denial of service (multiple-minute daemon hang) via input that is mishandled during hash-table interaction. Because there are many insertions into a single bucket, strcmp becomes slow. This is fixed in 3.4.2, 3.2.8, and 3.0.16. (CVE-2021-33582)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Run 'yum update cyrus-imapd' to update your system.

See Also

Plugin Details

Severity: High

ID: 155994

File Name: al2_ALAS-2021-1725.nasl

Version: 1.2

Type: local

Agent: unix

Published: 12/10/2021

Updated: 12/10/2021

Supported Sensors: Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent

Risk Information

CVSS Score Source: CVE-2021-33582


Risk Factor: Low

Score: 3.6


Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Temporal Vector: E:U/RL:OF/RC:C


Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:cyrus-imapd, p-cpe:/a:amazon:linux:cyrus-imapd-debuginfo, p-cpe:/a:amazon:linux:cyrus-imapd-devel, p-cpe:/a:amazon:linux:cyrus-imapd-utils, cpe:/o:amazon:linux:2

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 12/8/2021

Vulnerability Publication Date: 9/1/2021

Reference Information

CVE: CVE-2021-33582

ALAS: 2021-1725