Courier Mail Server < 0.53.2 Crafted Username Encoding DoS

High Nessus Network Monitor Plugin ID 3646


The remote host is vulnerable to a Denial of Service (DoS) attack.


The remote host is running Courier Mail Server, an open source mail server for Linux and Unix. The installed version of Courier is prone to a flaw in the way that it handles malformed 'login' strings. Specifically, an attacker who sends a username that includes a '


Upgrade to version 0.53.2 or higher.

See Also

Plugin Details

Severity: High

ID: 3646

Family: SMTP Servers

Published: 2006/06/12

Updated: 2019/03/06

Dependencies: 2004, 2005

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 7.8

Temporal Score: 6.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Temporal Vector: CVSS2#E:F/RL:OF/RC:C

CVSS v3.0

Base Score: 7.5

Temporal Score: 7

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

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:double_precision_incorporated:courier_mta

Exploitable With

Metasploit (TFTP Server for Windows 1.4 ST WRQ Buffer Overflow)

Reference Information

CVE: CVE-2006-2659

BID: 18345