CVE-2020-12673

A flaw was found in dovecot. An out-of-bounds read flaw was found in the way dovecot handled NTLM authentication allowing an attacker to crash the dovecot auth process repeatedly preventing login. The highest threat from this vulnerability is to system availability.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Upstream suggests that this flaw can be mitigated by disabling NTLM authentication. NTLM authentication can be disabled by using the configuration parameter "auth_mechanisms". More details available at: https://doc.dovecot.org/configuration_manual/authentication/authentication_mechanisms/