[Snyk] Security upgrade io.undertow:undertow-core from 2.2.13.Final to 2.3.21.Final

[sjmaple]

Snyk has created this PR to fix 1 vulnerabilities in the maven dependencies of this project.

Snyk changed the following file(s):

• tools/log4shellserver/pom.xml

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score	Upgrade
	Allocation of Resources Without Limits or Throttling SNYK-JAVA-IOUNDERTOW-15166617	167	io.undertow:undertow-core: 2.2.13.Final -> 2.3.21.Final No Path Found No Known Exploit

---

Important

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

---

Note: You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs.

For more information:
🧐 View latest project report
📜 Customise PR templates
🛠 Adjust project settings
📚 Read about Snyk's upgrade logic

---

Learn how to fix vulnerabilities with free interactive lessons:

🦉 Allocation of Resources Without Limits or Throttling