Debian Dovecot vulnerabilities

CVE-2019-11500 [CRITICAL] CVE-2019-11500: dovecot - In Dovecot before 2.2.36.4 and 2.3.x before 2.3.7.2 (and Pigeonhole before 0.5.7... In Dovecot before 2.2.36.4 and 2.3.x before 2.3.7.2 (and Pigeonhole before 0.5.7.2), protocol processing can fail for quoted strings. This occurs because '\0' characters are mishandled, and can lead to out-of-bounds writes and remote code execution. Scope: local bookworm: resolved (fixed in 1:2.3.7.2-1) bullseye: resolved (fixed in 1:2.3.7.2-1) forky: resolved (

CVE-2008-1218 [MEDIUM] CVE-2008-1218: dovecot - Argument injection vulnerability in Dovecot 1.0.x before 1.0.13, and 1.1.x befor... Argument injection vulnerability in Dovecot 1.0.x before 1.0.13, and 1.1.x before 1.1.rc3, when using blocking passdbs, allows remote attackers to bypass the password check via a password containing TAB characters, which are treated as argument delimiters that enable the skip_password_check field to be specified. Scope: local bookworm: resolved (fixed in 1:1.0.13-1)

CVE-2022-30550 [HIGH] CVE-2022-30550: dovecot - An issue was discovered in the auth component in Dovecot 2.2 and 2.3 before 2.3.... An issue was discovered in the auth component in Dovecot 2.2 and 2.3 before 2.3.20. When two passdb configuration entries exist with the same driver and args settings, incorrect username_filter and mechanism settings can be applied to passdb definitions. These incorrectly applied settings can lead to an unintended security configuration and can permit privilege esca

CVE-2026-24031 [HIGH] CVE-2026-24031: dovecot - Dovecot SQL based authentication can be bypassed when auth_username_chars is cle... Dovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin. This vulnerability allows bypassing authentication for any user and user enumeration. Do not clear auth_username_chars. If this is not possible, install latest fixed version. No publicly available exploits are known. Scope: local bookworm: resolved bullseye: resolved forky

CVE-2016-8652 [MEDIUM] CVE-2016-8652: dovecot - The auth component in Dovecot before 2.2.27, when auth-policy is configured, all... The auth component in Dovecot before 2.2.27, when auth-policy is configured, allows a remote attackers to cause a denial of service (crash) by aborting authentication without setting a username. Scope: local bookworm: resolved (fixed in 1:2.2.27-1) bullseye: resolved (fixed in 1:2.2.27-1) forky: resolved (fixed in 1:2.2.27-1) sid: resolved (fixed in 1:2.2.27-1) trix

CVE-2026-27858 [HIGH] CVE-2026-27858: dovecot - Attacker can send a specifically crafted message before authentication that caus... Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory. Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access to managesieve protocol, or install fixed version. No publicly available exploits are known. Scope: local bookworm: resolved (fixed

CVE-2017-14461 [MEDIUM] CVE-2017-14461: dovecot - A specially crafted email delivered over SMTP and passed on to Dovecot by MTA ca... A specially crafted email delivered over SMTP and passed on to Dovecot by MTA can trigger an out of bounds read resulting in potential sensitive information disclosure and denial of service. In order to trigger this vulnerability, an attacker needs to send a specially crafted email message to the server. Scope: local bookworm: resolved (fixed in 1:2.2.34-1) bullse

CVE-2026-27857 [MEDIUM] CVE-2026-27857: dovecot - Sending "NOOP (((...)))" command with 4000 parenthesis open+close results in ~1M... Sending "NOOP (((...)))" command with 4000 parenthesis open+close results in ~1MB extra memory usage. Longer commands will result in client disconnection. This 1 MB can be left allocated for longer time periods by not sending the command ending LF. So attacker could connect possibly from even a single IP and create 1000 connections to allocate 1 GB of memory, whic

CVE-2020-10957 [HIGH] CVE-2020-10957: dovecot - In Dovecot before 2.3.10.1, unauthenticated sending of malformed parameters to a... In Dovecot before 2.3.10.1, unauthenticated sending of malformed parameters to a NOOP command causes a NULL Pointer Dereference and crash in submission-login, submission, or lmtp. Scope: local bookworm: resolved (fixed in 1:2.3.10.1+dfsg1-1) bullseye: resolved (fixed in 1:2.3.10.1+dfsg1-1) forky: resolved (fixed in 1:2.3.10.1+dfsg1-1) sid: resolved (fixed in 1:2.3.1

CVE-2025-59032 [HIGH] CVE-2025-59032: dovecot - ManageSieve AUTHENTICATE command crashes when using literal as SASL initial resp... ManageSieve AUTHENTICATE command crashes when using literal as SASL initial response. This can be used to crash ManageSieve service repeatedly, making it unavailable for other users. Control access to ManageSieve port, or disable the service if it's not needed. Alternatively upgrade to a fixed version. No publicly available exploits are known. Scope: local bookworm:

CVE-2025-30189 [HIGH] CVE-2025-30189: dovecot - When cache is enabled, some passdb/userdb drivers incorrectly cache all users wi... 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. After cached login, all subsequent logins are for same user. Install fixed version or disable caching either globally or for the impacted passdb/userdb drivers. No publicly available exploits are known. Scope

CVE-2020-12674 [HIGH] CVE-2020-12674: dovecot - In Dovecot before 2.3.11.3, sending a specially formatted RPA request will crash... In Dovecot before 2.3.11.3, sending a specially formatted RPA request will crash the auth service because a length of zero is mishandled. Scope: local bookworm: resolved (fixed in 1:2.3.11.3+dfsg1-1) bullseye: resolved (fixed in 1:2.3.11.3+dfsg1-1) forky: resolved (fixed in 1:2.3.11.3+dfsg1-1) sid: resolved (fixed in 1:2.3.11.3+dfsg1-1) trixie: resolved (fixed in 1:

CVE-2020-25275 [HIGH] CVE-2020-25275: dovecot - Dovecot before 2.3.13 has Improper Input Validation in lda, lmtp, and imap, lead... Dovecot before 2.3.13 has Improper Input Validation in lda, lmtp, and imap, leading to an application crash via a crafted email message with certain choices for ten thousand MIME parts. Scope: local bookworm: resolved (fixed in 1:2.3.13+dfsg1-1) bullseye: resolved (fixed in 1:2.3.13+dfsg1-1) forky: resolved (fixed in 1:2.3.13+dfsg1-1) sid: resolved (fixed in 1:2.3.1

CVE-2020-12673 [HIGH] CVE-2020-12673: dovecot - In Dovecot before 2.3.11.3, sending a specially formatted NTLM request will cras... In Dovecot before 2.3.11.3, sending a specially formatted NTLM request will crash the auth service because of an out-of-bounds read. Scope: local bookworm: resolved (fixed in 1:2.3.11.3+dfsg1-1) bullseye: resolved (fixed in 1:2.3.11.3+dfsg1-1) forky: resolved (fixed in 1:2.3.11.3+dfsg1-1) sid: resolved (fixed in 1:2.3.11.3+dfsg1-1) trixie: resolved (fixed in 1:2.3.1

CVE-2019-7524 [HIGH] CVE-2019-7524: dovecot - In Dovecot before 2.2.36.3 and 2.3.x before 2.3.5.1, a local attacker can cause ... In Dovecot before 2.2.36.3 and 2.3.x before 2.3.5.1, a local attacker can cause a buffer overflow in the indexer-worker process, which can be used to elevate to root. This occurs because of missing checks in the fts and pop3-uidl components. Scope: local bookworm: resolved (fixed in 1:2.3.4.1-3) bullseye: resolved (fixed in 1:2.3.4.1-3) forky: resolved (fixed in 1:2.3

CVE-2025-59028 [MEDIUM] CVE-2025-59028: dovecot - When sending invalid base64 SASL data, login process is disconnected from the au... When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active authentication sessions to fail. Invalid BASE64 data can be used to DoS a vulnerable server to break concurrent logins. Install fixed version or disable concurrency in login processes (heavy perfomance penalty on large deployments). No publicly available e

CVE-2019-11494 [HIGH] CVE-2019-11494: dovecot - In the IMAP Server in Dovecot 2.3.3 through 2.3.5.2, the submission-login servic... In the IMAP Server in Dovecot 2.3.3 through 2.3.5.2, the submission-login service crashes when the client disconnects prematurely during the AUTH command. Scope: local bookworm: resolved (fixed in 1:2.3.4.1-5) bullseye: resolved (fixed in 1:2.3.4.1-5) forky: resolved (fixed in 1:2.3.4.1-5) sid: resolved (fixed in 1:2.3.4.1-5) trixie: resolved (fixed in 1:2.3.4.1-5)

CVE-2008-4907 [MEDIUM] CVE-2008-4907: dovecot - The message parsing feature in Dovecot 1.1.4 and 1.1.5, when using the FETCH ENV... The message parsing feature in Dovecot 1.1.4 and 1.1.5, when using the FETCH ENVELOPE command in the IMAP client, allows remote attackers to cause a denial of service (persistent crash) via an email with a malformed From address, which triggers an assertion error, aka "invalid message address parsing bug." Scope: local bookworm: resolved (fixed in 1:1.1.7-1) bullsey

CVE-2019-11499 [HIGH] CVE-2019-11499: dovecot - In the IMAP Server in Dovecot 2.3.3 through 2.3.5.2, the submission-login compon... In the IMAP Server in Dovecot 2.3.3 through 2.3.5.2, the submission-login component crashes if AUTH PLAIN is attempted over a TLS secured channel with an unacceptable authentication message. Scope: local bookworm: resolved (fixed in 1:2.3.4.1-5) bullseye: resolved (fixed in 1:2.3.4.1-5) forky: resolved (fixed in 1:2.3.4.1-5) sid: resolved (fixed in 1:2.3.4.1-5) trix

CVE-2024-23185 [HIGH] CVE-2024-23185: dovecot - Very large headers can cause resource exhaustion when parsing message. The messa... Very large headers can cause resource exhaustion when parsing message. The message-parser normally reads reasonably sized chunks of the message. However, when it feeds them to message-header-parser, it starts building up "full_value" buffer out of the smaller chunks. The full_value buffer has no size limit, so large headers can cause large memory usage. It doesn't m