An attacker that has valid credentials can use a Sieve script with the editheader extension to trigger a use-after-free in the mail editing code, and to write memory contents…

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

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

An unauthenticated attacker can send an IMAP ID command with a very large number of parameters before logging in, which causes memory and CPU usage to grow disproportionately

An unauthenticated attacker can crash the ManageSieve login process by sending a small malformed command before authenticating

An attacker that can send mail to a user can craft a message whose headers contain a very large number of email addresses or MIME parameters, which causes excessive memory usage…

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

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

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

Very large headers can cause resource exhaustion when parsing message

An attacker that holds a token intended for a different purpose can authenticate, because when an OAuth2 token response does not contain a scope claim, the audience claim is used…

None None None No publicly available exploits are known

When cache is enabled, some passdb/userdb drivers incorrectly cache all users with same cache key, causing wrong cached information to be used for these users

An attacker that has valid credentials can send crafted compressed data that causes the affected process to exhaust its stack and crash

An attacker that has valid credentials can select a compression algorithm for the IMAP connection whose decompression state requires a large amount of memory, and open several…

An attacker that can send mail to a user can craft a message header whose values are chosen to collide in an internal hash table, which makes the IMAP THREAD command consume CPU…

An attacker that can send mail to a user can craft a message header that makes the IMAP THREAD command consume CPU disproportionate to the size of the message

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

An attacker that holds an OAuth2 token granting only part of the required scopes can authenticate, because when more than one scope is required in the configuration, the remote…

An attacker that can get Dovecot to relay a message, for example through Sieve redirect or submission relay, can use a crafted line ending in the message body to bypass the…

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

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

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

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…

Dovecot accepts dot LF DOT LF symbol as end of DATA command

Having a large number of address headers (From, To, Cc, Bcc, etc.) becomes excessively CPU intensive

Mail content stored by a user can be crafted so that it is interpreted as dsync protocol commands when an administrator later runs dsync with the stream protocol, for example…

A host listed as a trusted proxy can send forwarding information containing a NUL byte, which crashes the login process on the following login attempt

An attacker that has valid credentials can send an invalid IMAP URLFETCH command, which causes uninitialized memory to be included in the error response returned to the client

Forwarding information received from a host listed as a trusted proxy is not kept separate from Dovecot's own authentication fields, so a value sent by that host can be injected…

An attacker that has valid credentials can open many connections to the imap-hibernate service and send invalid commands, which can intermittently cause an out-of-bounds read and…

An attacker that has valid credentials can submit a Sieve script containing an extreme numeric literal, which causes an out-of-bounds write when the ManageSieve service compiles…

An attacker that has valid credentials can use IMAP LIST command to consume CPU

When mail_max_userip_connections is set (default 10) and reached, submission-login can crash with epoll() panic caused by file descriptor handling issues

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

When IMAP compression is enabled, the same compression state is reused across responses in a session, so response sizes depend on both attacker-supplied mail and other mail in the…

Sieve CPU resource usage is tracked in the compiled script, so an attacker that has valid credentials can reset the accounting by repeatedly changing the active script

The comparison used for the doveadm password and API key is not fully timing safe and can reveal the length of the configured secret

None None None No publicly available exploits are known