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Medium, CVSS 5.3

Apache Struts vulnerable to possible DoS attack when using URLValidator

CVE-2016-4465GHSA-xg75-68x3-7p3q

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.apache.struts:struts2-core 2.5.13, 2.3.29), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.3 · CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS
  • CVE-2016-4465: 10.37% estimated exploitation activity in the next 30 days; percentile 95.73 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

The URLValidator class in Apache Struts 2 2.3.20 through 2.3.28.1 and 2.5.x before 2.5.13 allows remote attackers to cause a denial of service via a null value for a URL field.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-xg75-68x3-7p3q

Agent brief

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# Patch Next advisory brief: CVE-2016-4465

Advisory: Apache Struts vulnerable to possible DoS attack when using URLValidator
IDs: CVE-2016-4465, GHSA-xg75-68x3-7p3q
Record: https://patchnext.com/advisories/cve-2016-4465 (revision 1, source checked 26 Oct 2026, 16:24 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.apache.struts:struts2-core 2.5.13, 2.3.29. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.apache.struts:struts2-core: affected >= 2.3.20, < 2.3.29; >= 2.5.0, < 2.5.13; fixed in 2.3.29, 2.5.13

## Suggested inspection (read-only)
- Maven org.apache.struts:struts2-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.struts:struts2-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-xg75-68x3-7p3q (GitHub-reviewed advisory GHSA-xg75-68x3-7p3q lists affected ranges: Maven org.apache.struts:struts2-core >=2.3.20 =2.5.0 <2.5.13)

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