CVE-2021-40110 : What You Need to Know
Learn about the Apache James IMAP vulnerability to a Denial of Service attack and how to protect systems. Find out about the affected versions and mitigation steps.
Apache James IMAP vulnerability to a ReDoS.
Understanding CVE-2021-40110
Apache James IMAP vulnerability details.
What is CVE-2021-40110?
A vulnerability in Apache James IMAP allows an attacker to execute a Denial of Service attack using malicious IMAP LIST commands.
The Impact of CVE-2021-40110
The vulnerability is rated as moderate.
Technical Details of CVE-2021-40110
Details about the vulnerability.
Vulnerability Description
- Using Jazzer fuzzer, an IMAP user can exploit a vulnerable Regular expression in Apache James to orchestrate a Denial of Service attack.
Affected Systems and Versions
- Product: Apache James
- Vendor: Apache Software Foundation
- Versions affected: Apache James <= 3.6.0
Exploitation Mechanism
- Crafting malicious IMAP LIST commands to exploit the vulnerable Regular expression.
Mitigation and Prevention
Protecting against CVE-2021-40110.
Immediate Steps to Take
- Upgrade to Apache James 3.6.1 or higher to enforce the use of RE2J regular expression engine.
Long-Term Security Practices
- Regularly update and patch Apache James software.
- Monitor security mailing lists for updates.
- Implement network firewalls and intrusion detection systems.
Patching and Updates
- Apply security patches promptly.