CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
75.7%
Severity: Medium
Date : 2019-04-18
CVE-ID : CVE-2019-10691
Package : dovecot
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-950
The package dovecot before version 2.3.5.2-1 is vulnerable to denial of
service.
Upgrade to 2.3.5.2-1.
The problem has been fixed upstream in version 2.3.5.2.
None.
JSON encoder in Dovecot 2.3 incorrectly assert-crashes when encountering
invalid UTF-8 characters. This can be used to crash dovecot in two
ways. Attacker can repeatedly crash Dovecot authentication process by
logging in using invalid UTF-8 sequence in username. This requires that
auth policy is enabled. Crash can also occur if OX push notification
driver is enabled and an email is delivered with invalid UTF-8 sequence
in From or Subject header. In 2.2, malformed UTF-8 sequences are
forwarded “as-is”, and thus do not cause problems in Dovecot itself.
Target systems should be checked for possible problems in dealing with
such sequences.
An attacker is able to crash the dovecot process by making it process a
username or email containing an unsupported UTF-8 sequence.
https://wiki.dovecot.org/Authentication/Policy
https://security.archlinux.org/CVE-2019-10691
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
75.7%