What is the severity of CVE-2021-40110?

The severity of CVE-2021-40110 is high, with a severity score of 7.5.

What software is affected by CVE-2021-40110?

Apache James versions prior to 3.6.1 are affected by CVE-2021-40110.

How can I fix CVE-2021-40110?

To fix CVE-2021-40110, upgrade to Apache James 3.6.1 or higher, which enforces the use of RE2.

Where can I find more information about CVE-2021-40110?

You can find more information about CVE-2021-40110 in the references: [link1](http://www.openwall.com/lists/oss-security/2022/01/04/2) and [link2](https://www.openwall.com/lists/oss-security/2022/01/04/2).

Vulnerability/
CVE-2021-40110

high

7.5

4/1/2022

8/1/2022

4/8/2024

CVE-2021-40110: Apache James IMAP vulnerable to a ReDoS

Q: What is CVE-2021-40110?

CVE-2021-40110 is a vulnerability in Apache James, where an IMAP user can craft IMAP LIST commands to orchestrate a Denial of Service attack using a vulnerable regular expression.

First published: Tue Jan 04 2022(Updated: )

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.

Credit: security@apache.org security@apache.org

Affected Software	Affected Version	How to fix
Apache James	<3.6.1
maven/org.apache.james:james-server	>=3.1.0<3.6.1	3.6.1

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Frequently Asked Questions

What is CVE-2021-40110?
CVE-2021-40110 is a vulnerability in Apache James, where an IMAP user can craft IMAP LIST commands to orchestrate a Denial of Service attack using a vulnerable regular expression.
What is the severity of CVE-2021-40110?
The severity of CVE-2021-40110 is high, with a severity score of 7.5.
What software is affected by CVE-2021-40110?
Apache James versions prior to 3.6.1 are affected by CVE-2021-40110.
How can I fix CVE-2021-40110?
To fix CVE-2021-40110, upgrade to Apache James 3.6.1 or higher, which enforces the use of RE2.
Where can I find more information about CVE-2021-40110?
You can find more information about CVE-2021-40110 in the references: [link1](http://www.openwall.com/lists/oss-security/2022/01/04/2) and [link2](https://www.openwall.com/lists/oss-security/2022/01/04/2).

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