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Vulnerability Details : CVE-2017-2669

Dovecot before version 2.2.29 is vulnerable to a denial of service. When 'dict' passdb and userdb were used for user authentication, the username sent by the IMAP/POP3 client was sent through var_expand() to perform %variable expansion. Sending specially crafted %variable fields could result in excessive memory usage causing the process to crash (and restart), or excessive CPU usage causing all authentications to hang.
Publish Date : 2018-06-21 Last Update Date : 2019-10-09
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of Service

- Products Affected By CVE-2017-2669

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 8.0 Version Details Vulnerabilities
2 Application Dovecot Dovecot 2.2.26 Version Details Vulnerabilities
3 Application Dovecot Dovecot Version Details Vulnerabilities
4 Application Dovecot Dovecot 2.2.27 Version Details Vulnerabilities
5 Application Dovecot Dovecot 2.2.28 - Version Details Vulnerabilities
6 Application Dovecot Dovecot 2.2.28 RC1 Version Details Vulnerabilities
7 Application Dovecot Dovecot 2.2.28 RC2 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 1
Dovecot Dovecot 6

- References For CVE-2017-2669
MLIST [oss-security] 20170411 CVE-2017-2669: Dovecot DoS when passdb dict was used for authentication
BID 97536 Dovecot CVE-2017-2669 Denial of Service Vulnerability Release Date:2017-04-18 CONFIRM
MLIST [dovecot-news] 20170410 v2.2.29 released CONFIRM

- Metasploit Modules Related To CVE-2017-2669

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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