CVE-2019-11499 Denial of service in n/a
An attacker can crash the Dovecot submission-login component by sending a malformed AUTH PLAIN message over TLS, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2019-11499?
CVE-2019-11499 is a high-severity denial of service vulnerability in Dovecot Dovecot, published on 8 May 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2019-11499?
It affects 3 products.
Products include Dovecot Dovecot, Fedoraproject Fedora, Opensuse Leap.
How do I fix CVE-2019-11499?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2019-11499 being exploited?
There is no known exploitation of CVE-2019-11499 in the wild and no public exploit code.
Other vulnerabilities in Dovecot Dovecot
Sources
Also known as ALPINE-CVE-2019-11499, DEBIAN-CVE-2019-11499, GHSA-v7jr-wfqh-v962.