Related Vulnerabilities: CVE-2019-11499  

Submission-login crashes when authentication is started over TLS secured channel and invalid authentication message is sent. This can lead to denial-of-service attack by persistent attacker(s).

Severity Medium

Remote Yes

Type Denial of service

Description

Submission-login crashes when authentication is started over TLS secured  channel and invalid authentication message is sent. This can lead to  denial-of-service attack by persistent attacker(s).

AVG-954 dovecot 2.3.5.2-1 Medium Vulnerable

https://www.mail-archive.com/fulldisclosure@seclists.org/msg06126.html