CVE-2020-12100
dovecot: Resource exhaustion via deeply nested MIME parts
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · August 12, 2020
Updated · November 22, 2025
Description
A flaw was found in dovecot. A remote attacker could cause a denial of service by repeatedly sending emails containing MIME parts containing malicious content of which dovecot will attempt to parse. The highest threat from this vulnerability is to system availability.
CVSS score applicability
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.
Mitigation
Upstream suggests that this flaw can be mitigated by limiting MIME structures in MTA
CVSS / CWE
CVSS 3.1 · 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-674 · Uncontrolled Recursion