Apache Tomcat - Denial of Service

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2024-34750: 4.60% estimated exploitation activity in the next 30 days; percentile 91.68 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Improper Handling of Exceptional Conditions, Uncontrolled Resource Consumption vulnerability in Apache Tomcat. When processing an HTTP/2 stream, Tomcat did not handle some cases of excessive HTTP headers correctly. This led to a miscounting of active HTTP/2 streams which in turn led to the use of an incorrect infinite timeout which allowed connections to remain open which should have been closed. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.0-M20, from 10.1.0-M1 through 10.1.24, from 9.0.0-M1 through 9.0.89. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 though 8.5.100. Users are recommended to upgrade to version 11.0.0-M21, 10.1.25 or 9.0.90, which fixes the issue.

Published by the source

3 Jul 2024, 21:39 UTC

Last modified by the source

3 Nov 2025, 21:31 UTC

Source last checked

26 Oct 2026, 16:40 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-wm9w-rjj3-j356

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# Patch Next advisory brief: CVE-2024-34750

Advisory: Apache Tomcat - Denial of Service
IDs: CVE-2024-34750, GHSA-wm9w-rjj3-j356
Record: https://patchnext.com/advisories/cve-2024-34750 (revision 1, source checked 26 Oct 2026, 16:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: org.apache.tomcat:tomcat-coyote 11.0.0-M21, 10.1.25, 9.0.90; org.apache.tomcat.embed:tomcat-embed-core 11.0.0-M21, 10.1.25, 9.0.90. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.apache.tomcat:tomcat-coyote: affected >= 11.0.0-M1, < 11.0.0-M21; >= 10.1.0-M1, < 10.1.25; >= 9.0.0-M1, < 9.0.90; >= 8.5.0, <= 8.5.100; fixed in 11.0.0-M21, 9.0.90, 10.1.25
- Maven org.apache.tomcat.embed:tomcat-embed-core: affected >= 11.0.0-M1, < 11.0.0-M21; >= 10.1.0-M1, < 10.1.25; >= 9.0.0-M1, < 9.0.90; >= 8.5.0, <= 8.5.100; fixed in 11.0.0-M21, 9.0.90, 10.1.25

## Suggested inspection (read-only)
- Maven org.apache.tomcat:tomcat-coyote: check the installed version with your package manager.
- Maven org.apache.tomcat.embed:tomcat-embed-core: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.apache.tomcat:tomcat-coyote, org.apache.tomcat.embed:tomcat-embed-core.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-wm9w-rjj3-j356 (GitHub-reviewed advisory GHSA-wm9w-rjj3-j356 lists affected ranges: Maven org.apache.tomcat.embed:tomcat-embed-core >=11.0.0-M1 =10.1.0-M1 =9.0.0-M1 =8.5.0 =11.0.0-M1 =10.1.0-M1 =9.0.0-M1 =8.5.0 <=8.5.100)

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