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CVE-2019-11500

dovecot: improper NULL byte handling in IMAP and ManageSieve protocol parsers leads to out of bounds writes

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.

CVSS 3.0 · 9.8 Critical EPSS 62.3% KEV · Not listed
Vendors
Debian Dovecot Fedoraproject and 1 more
Products
Debian Linux Dovecot Pigeonhole and 2 more
CVE-2019-11499

dovecot: unacceptable authentication message in AUTH PLAIN over TLS leads to crash and possible DoS

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.

CVSS 3.1 · 7.5 High EPSS 2.5% KEV · Not listed
Vendors
Dovecot Fedoraproject Opensuse
Products
Dovecot Fedora Leap
CVE-2019-11494

dovecot: premature disconnection from client during AUTH command leads to crash and possible DoS

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.

CVSS 3.1 · 7.5 High EPSS 2.4% KEV · Not listed
Vendors
Dovecot Fedoraproject Opensuse
Products
Dovecot Fedora Leap
CVE-2019-10691

dovecot: Mishandling invalid UTF-8 characters by JSON encoder leading to possible DoS attack.

The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username.

CVSS 3.0 · 7.5 High EPSS 2.8% KEV · Not listed
Vendors
Dovecot Opensuse
Products
Dovecot Leap
CVE-2017-2669

dovecot: Dovecot DoS when passdb dict was used for authentication

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.

CVSS 3.0 · 3.7 Low EPSS 4.3% KEV · Not listed
Vendors
Debian Dovecot
Products
Debian Linux Dovecot
CVE-2017-15132

dovecot: Auth leaks memory if SASL authentication is aborted

A flaw was found in dovecot 2.0 up to 2.2.33 and 2.3.0. An abort of SASL authentication results in a memory leak in dovecot's auth client used by login processes. The leak has impact in high performance configuration where same login processes are reused and can cause the process to crash due to memory exhaustion.

CVSS 3.0 · 7.5 High EPSS 3.1% KEV · Not listed
Vendors
Canonical Debian Dovecot
Products
Ubuntu Linux Debian Linux Dovecot
CVE-2017-15130

dovecot: TLS SNI config lookups are inefficient and can be used for DoS

A denial of service flaw was found in dovecot before 2.2.34. An attacker able to generate random SNI server names could exploit TLS SNI configuration lookups, leading to excessive memory usage and the process to restart.

CVSS 3.0 · 5.9 Medium EPSS 2.6% KEV · Not listed
Vendors
Canonical Debian Dovecot
Products
Ubuntu Linux Debian Linux Dovecot
CVE-2017-14461

dovecot: Information Leak Vulnerability in rfc822_parse_domain leading to denial-of-service

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.

CVSS 3.0 · 5.9 Medium EPSS 16.7% KEV · Not listed
Vendors
Debian Dovecot Ubuntu
Products
Debian Linux Dovecot Ubuntu
CVE-2016-4983

dovecot insecure SSL/TLS key and certificate file creation

A postinstall script in the dovecot rpm allows local users to read the contents of newly created SSL/TLS key files.

CVSS 3.1 · 3.3 Low EPSS < 1% KEV · Not listed
Vendors
Dovecot Opensuse Redhat
Products
Dovecot Leap Opensuse and 1 more