Apache Tomcat - Fix for CVE-2023-24998 was incomplete

Exploitation

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

CVSS

7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

• CVE-2023-28709: 48.03% estimated exploitation activity in the next 30 days; percentile 98.86 (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.

The fix for CVE-2023-24998 was incomplete. If non-default HTTP connector settings were used such that the maxParameterCount could be reached using query string parameters and a request was submitted that supplied exactly maxParameterCount parameters in the query string, the limit for uploaded request parts could be bypassed with the potential for a denial of service to occur.

Published by the source

6 Jul 2023, 21:14 UTC

Last modified by the source

24 Apr 2024, 19:16 UTC

Source last checked

26 Oct 2026, 16:30 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-cx6h-86xw-9x34

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# Patch Next advisory brief: CVE-2023-28709

Advisory: Apache Tomcat - Fix for CVE-2023-24998 was incomplete
IDs: CVE-2023-28709, GHSA-cx6h-86xw-9x34
Record: https://patchnext.com/advisories/cve-2023-28709 (revision 1, source checked 26 Oct 2026, 16:30 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.apache.tomcat:tomcat-coyote 8.5.88; org.apache.tomcat.embed:tomcat-embed-core 11.0.0-M5, 10.1.8, 9.0.74. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.apache.tomcat:tomcat-coyote: affected >= 8.5.85, < 8.5.88; fixed in 8.5.88
- Maven org.apache.tomcat.embed:tomcat-embed-core: affected >= 11.0.0-M2, < 11.0.0-M5; >= 10.1.5, < 10.1.8; >= 9.0.71, < 9.0.74; fixed in 10.1.8, 11.0.0-M5, 9.0.74

## 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
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## 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-cx6h-86xw-9x34 (GitHub-reviewed advisory GHSA-cx6h-86xw-9x34 lists affected ranges: Maven org.apache.tomcat.embed:tomcat-embed-core >=11.0.0-M2 =10.1.5 =9.0.71 =8.5.85 <8.5.88)

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