# CVE-2024-3653: undertow: A vulnerability was found in Undertow

CVE-2024-3653 is fixed in undertow on 1 platform by DEBIAN-CVE-2024-3653 (version 2.3.18-1), released July 8, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-3653
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0187
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 8, 2024

## Description

A vulnerability was found in Undertow. This issue requires enabling the learning-push handler in the server's config, which is disabled by default, leaving the maxAge config in the handler unconfigured. The default is -1, which makes the handler vulnerable. If someone overwrites that config, the server is not subject to the attack. The attacker needs to be able to reach the server with a normal HTTP request.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | undertow Debian 14 | 2.3.18-1 | [DEBIAN-CVE-2024-3653](https://patchblox.com/security/data/fix/linux/debian-cve-2024-3653.md) | Jul 8, 2024 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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