CVE-2021-40110: Apache James

High severity, CVSS 7.5. EPSS: 2.9% chance of exploitation in the next 30 days.

In Apache James, using Jazzer fuzzer, we identified that an IMAP user can craft IMAP LIST commands to orchestrate a Denial Of Service using a vulnerable Regular expression. This affected Apache James prior to 3.6.1 We recommend upgrading to Apache James 3.6.1 or higher , which enforce the use of RE2J regular expression engine to execute regex in linear time without back-tracking.

Affected products

• Apache James: before 3.6.1 (fixed in 3.6.1)

Published 2022-01-04. Last modified 2026-06-17.