Dovecot Denial of Service Vulnerability

CVE-2017-2669 · MEDIUM Severity

AV:N/AC:L/AU:N/C:N/I:N/A:P

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.

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