CVE-2020-28200 Denial of service in n/a
An attacker can cause denial of service in Dovecot by submitting complex regular expressions to the Sieve engine, leading to uncontrolled resource consumption.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-28200?
CVE-2020-28200 is a medium-severity denial of service vulnerability in Dovecot Dovecot, published on 28 Jun 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Sieve engine in Dovecot before 2.3.15 allows Uncontrolled Resource Consumption, as demonstrated by a situation with a complex regular expression for the regex extension.
Weakness: CWE-770
Which versions are affected by CVE-2020-28200?
It affects 2 products.
Products include Dovecot Dovecot, Fedoraproject Fedora.
How do I fix CVE-2020-28200?
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-2020-28200 being exploited?
There is no known exploitation of CVE-2020-28200 in the wild and no public exploit code.
Other vulnerabilities in Dovecot Dovecot
Sources
Also known as AZL-7194, DEBIAN-CVE-2020-28200, GHSA-f6jc-wwhw-gpq7, UBUNTU-CVE-2020-28200.