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Vulnerability record · CVE-2021-40111 · published 4 January 2022

CVE-2021-40111: Apache james vulnerability

Apache · James

In Apache James, while fuzzing with Jazzer the IMAP parsing stack, we discover that crafted APPEND and STATUS IMAP command could be used to trigger infinite loops resulting in expensive CPU computations and OutOfMemory exceptions. This can be used for a Denial Of Service attack. The IMAP user needs to be authenticated to exploit this vulnerability. This affected Apache James prior to version 3.6.1. This vulnerability had been patched in Apache James 3.6.1 and higher. We recommend the upgrade.

6.5 CVSS 3.1 Medium EPSS 2.1% · top 18.9% CWE-835 · CWE-835
6.5CVSS 3.1 base score, v2 4.0
2.1%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, while fuzzing with Jazzer the IMAP parsing stack, we discover that crafted APPEND and STATUS IMAP command could be used to trigger infinite loops resulting in expensive CPU computations and OutOfMemory exceptions. This can be used for a Denial Of Service attack. The IMAP user needs to be authenticated to exploit this vulnerability. This affected Apache James prior to version 3.6.1. This vulnerability had been patched in Apache James 3.6.1 and higher. We recommend the upgrade.

CVSS:3.1/AV:N/AC:L/PR:L/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/2022/01/04/3 Mailing ListThird Party Advisory
https://www.openwall.com/lists/oss-security/2022/01/04/3 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2022/01/04/3 Mailing ListThird Party Advisory
https://www.openwall.com/lists/oss-security/2022/01/04/3 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-2021-40111), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.