Multiple unspecified vulnerabilities in Dovecot before 1.0beta3 allow remote attackers to cause a denial of service (application crash or hang) via unspecified vectors involving (1) "potential hangs" in the APPEND command and "potential crashes" in (2) dovecot-auth and (3) imap/pop3-login. NOTE: vector 2 might be related to a double free vulnerability.
CVSS Severity (version 2.0):
Impact Subscore: 2.9
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows disruption of service
Official Statement from Red Hat (08/16/2006)
This issue only affected Dovecot versions 1.0beta1 and 1.0beta2. Red Hat Enterprise Linux 4 shipped with an earlier version of Dovecot and is therefore not vulnerable to this issue.
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[Dovecot] 20060208 1.0beta3 released
Vulnerable software and versions