CVE-2024-24549 Apache Tomcat: HTTP/2 header handling DoS

What is CVE-2024-24549?

CVE-2024-24549 is a high-severity denial of service vulnerability in Apache Tomcat, published on 13 Mar 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Denial of Service due to improper input validation vulnerability for HTTP/2 requests in Apache Tomcat. When processing an HTTP/2 request, if the request exceeded any of the configured limits for headers, the associated HTTP/2 stream was not reset until after all of the headers had been processed.This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.0-M16, from 10.1.0-M1 through 10.1.18, from 9.0.0-M1 through 9.0.85, from 8.5.0 through 8.5.98. Other, older, EOL versions may also be affected.

Users are recommended to upgrade to version 11.0.0-M17, 10.1.19, 9.0.86 or 8.5.99 which fix the issue.

Weakness: CWE-20

Which versions are affected by CVE-2024-24549?

17 open source packages ship an affected version, including org.apache.tomcat.embed:tomcat-embed-core, tomcat and org.apache.tomcat:tomcat-coyote. It affects 3 products.

Products include Apache Tomcat, Debian Debian Linux, Fedoraproject Fedora.

How do I fix CVE-2024-24549?

Upgrade org.apache.tomcat.embed:tomcat-embed-core to a fixed version for your release line: 10.1.19, 11.0.0-M17, 8.5.99 or 9.0.86.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2024-24549 being exploited?

There is no known exploitation of CVE-2024-24549 in the wild and no public exploit code.

Public exploit code: 2 proofs of concept on GitHub.

Other vulnerabilities in Apache Tomcat

• CVE-2025-24813 Apache Tomcat Path Equivalence Exploited Critical 10.0
• CVE-2016-8735 Apache Tomcat Remote Code Execution Exploited Critical 9.8
• CVE-2017-12617 Apache Tomcat Remote Code Execution Exploited High 8.1
• CVE-2017-12615 Apache Tomcat on Windows Remote Code Execution Exploited High 8.1
• CVE-2026-34486 Apache Tomcat Missing Encryption of Sensitive Data Exploited High 7.5

All Apache Tomcat vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-tomcat-2024-24549, CLSA-2025-1740051873, DEBIAN-CVE-2024-24549, GHSA-7w75-32cg-r6g2, ROOT-APP-MAVEN-CVE-2024-24549, UBUNTU-CVE-2024-24549.