CVE-2020-7957 Denial of service in n/a
Attackers can cause a denial of service in Dovecot IMAP/LMTP by triggering mishandled snippet generation, preventing recipients from reading messages.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-7957?
CVE-2020-7957 is a low-severity denial of service vulnerability in Dovecot Dovecot, published on 12 Feb 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The IMAP and LMTP components in Dovecot 2.3.9 before 2.3.9.3 mishandle snippet generation when many characters must be read to compute the snippet and a trailing > character exists. This causes a denial of service in which the recipient cannot read all of their messages.
Weakness: CWE-20
Which versions are affected by CVE-2020-7957?
It affects 2 products.
Products include Dovecot Dovecot, Fedoraproject Fedora.
How do I fix CVE-2020-7957?
Apply the vendor's patch.
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-2020-7957 being exploited?
There is no known exploitation of CVE-2020-7957 in the wild and no public exploit code.
Other vulnerabilities in Dovecot Dovecot
Sources
Also known as ALPINE-CVE-2020-7957, GHSA-vg8f-j3m8-7g9v.