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Vulnerability record · CVE-2021-40110 · published 4 January 2022

CVE-2021-40110: Apache james vulnerability

Apache · James

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.

7.5 CVSS 3.1 High EPSS 2.9% · top 13.8%
7.5CVSS 3.1 base score, v2 5.0
2.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2022/01/04/2 Mailing ListThird Party Advisory
https://www.openwall.com/lists/oss-security/2022/01/04/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2022/01/04/2 Mailing ListThird Party Advisory
https://www.openwall.com/lists/oss-security/2022/01/04/2 Mailing ListThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-40110), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.