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When safe filter is used with variable expansion, all following pipelines on the same string are incorrectly interpreted as safe too, enabling unsafe data to be unescaped.

Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory.

ManageSieve AUTHENTICATE command crashes when using literal as SASL initial response.

When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active authentication sessions to fail.

Dovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin.

Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack.

Sending "NOOP (((...)))" command with 4000 parenthesis open+close results in ~1MB extra memory usage.

Dovecot OTP authentication is vulnerable to replay attack under specific conditions.

Attacker can use a specially crafted base64 exchange between Dovecot and Client to fake SCRAM TLS channel binding.

A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU.

When dovecot has been configured to use per-domain passwd files, and they are placed one path component above /etc, or slash has been added to allowed characters, path traversal can happen if the domain component is dire…

Attacker can upload a malicious Sieve script over ManageSieve service (or locally) to bypass configured CPU time limits for Sieve up to 130 times of the configured limit.

If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authentication.

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP.

Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imap_acl_allow_anyone=no.

Dovecot has provided a script to use for attachment to text conversion.