How severe is CVE-2012-4387?

No CVSS score has been assigned to CVE-2012-4387 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2012-4387?

CVE-2012-4387 affects the following packages: org.apache.struts.xwork:xwork-core (Maven). Ecosystems affected: Maven.

How do I fix CVE-2012-4387?

Update org.apache.struts.xwork:xwork-core to 2.3.4.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2012-4387 is resolved across your whole dependency graph.

How do I detect CVE-2012-4387 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.struts.xwork:xwork-core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2012-4387 if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is CVE-2012-4387 actively exploited in the wild?

No public exploit code has been indexed for CVE-2012-4387 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2012-4387?

CVE-2012-4387 has an EPSS (Exploit Prediction Scoring System) score of 8.1%, placing it in the 95th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2012-4387?

CVE-2012-4387 is classified as CWE-264 (CWE-264). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2012-4387 published, and has it been updated?

CVE-2012-4387 was published on May 17, 2022 and was last updated on December 6, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕ Maven

Not in CISA KEV

CVE-2012-4387 — xwork-core

Fix: apache/struts@80e0318

CVE-2012-4387 is a CWE-264 vulnerability in org.apache.struts.xwork:xwork-core. A fix is available for org.apache.struts.xwork:xwork-core — see the affected versions and patch details below.

Denial of service in Apache Struts

Published

May 17, 2022

Updated

Dec 6, 2024

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Oct 30, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

8.1%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs95th percentile — riskier than 95% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

☕org.apache.struts.xwork:xwork-core

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Apache Struts 2.0.0 through 2.3.4 allows remote attackers to cause a denial of service (CPU consumption) via a long parameter name, which is processed as an OGNL expression.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.apache.struts.xwork:xwork-core`	≥ 2.0.0&&< 2.3.4.1	2.3.4.1`org.apache.struts.xwork:xwork-core:2.3.4.1`

Affected Products

1 product · 35 configurations

Application

strutsapache

35 versions

2.0.02.0.12.0.22.0.32.0.42.0.52.0.62.0.72.0.82.0.92.0.102.0.11

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.struts.xwork:xwork-core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.apache.struts.xwork:xwork-core to 2.3.4.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2012-4387 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

Apache Struts 2.0.0 through 2.3.4 allows remote attackers to cause a denial of service (CPU consumption) via a long parameter name, which is processed as an OGNL expression.

O3 Security · Impact-Aware SCA

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